What is/are your the most favourite composer s ?

...not neccesarily classical but the ones that just blasting song after song, I just mean a serious one i.e. with sophistication level certainly higher than a 12-bar blues.

I nominate the following in no particular order:

Irmin Schmidt,
Astor Piazzolla,
At the top of my list are Bach, Schubert, Vaughan Williams, and Arvo Pärt. Of course, this doesn't even scratch the surface :-).
Mahler, Brahms, and J S Bach, for emotional involvement. This is one difficult question, you know!
Vaughan Williams

No particular order. List subject to change without notice.

The guy never erased a note. Gotta admire someone who wastes no ink.

His classical compositions are not only technically amazing but amazingly popular. I never liked opera until I had to study Don Giavonni (spelling) in college. ALl I can say is that Mozart knew how to make opera both interesting and accessable while being musical masterpieces at the same time.

Critics might poo-poo popularity, but there is something to be said for being able to create music with such universal appeal. Especially when a genius creates art which has such a wide audience. 99 times out of 100 geniuses are so disconnected from reality and the common man that their work is only enjoyed by an elite minority who are extreme fans of the art already.

My top 3 are Tchaikovsky, Brahms, and Beethoven.

Hands down my favorite is Rachmaninoff, how ever honorable mentions go to:
The Strauss clan(but in particular Eduard and Johann Jr.)
A Dvorak
J Offenbach
J Brahms
G Mahler
WA Mozart
JS Bach
M Ravel
C Debussy
L Bernstein
S Prokofiev
P Tchaikovsky
P Warlock
and of course F Chopin

The one who I am not enamoured with(don't know why) is LV Beethoven. Any thing from the Baroque period is very interesting to me in particular the Harpsichord- I simply love the harpsichord for an unknown reason. I am sure I missed some greats but this was a quick list.
Tough question for me: You know, I can't think well,right now---(I told that to my perspective boss and was hired on the spot.)----Some of the most beautiful music ever written would be: Beethoven's 9th. Rach's paino #2 (none of his others do it for me) Vivaldi's 4 Seasons ,Beethoven's Emperor,then we got Mr.Mozart;and for him it's the piano concertos. BUT when I think of the # of compositions by all these guys (most well over 1,000) it brings me to Mr. Antonin Dvorak. He gets my vote on percentage,(I don't actually know how many) Symphony #9;THEE finest Cello cncerto; Symphonic Dances;the quartets.There is so much great composition by so many GREATS that this is just a brief highlight of "some" of my favorites. I understand we all have our own.
Sibelius tops my list for regular repeat listening, then Mahler, Chopin, Liszt, Debussy, Brahms, Dvorak and Beethoven.
Hmmm, some very personal factors involved in this answer. The first classical composer that I can remember touching me deeply was Jean Sibelius (I used to lie on the floor in front of my parents' console record player listening to "Swan of Tuonela"). In the many years since then, the list of favorite composers has expanded a lot, and now includes (in no particular order):
1. Mozart (extraordinary range of compositions, and even his earliest works are good -- the late ones border on sublime);
2. Johann Sebastian Bach
3. Ludwig von Beethoven
4. Johannes Brahms
5. Archangelo Corelli
6. Antonio Vivaldi
7. Richard Wagner
8. Franz Liszt
9. Frederick Chopin
10. Antonin Dvorak
11. Anton Bruckner
12. George Frederick Handel
13. Peter Tchaikowsky
14. Camille Saint-Saens
15. Felix Mendelssohn
16. Jean Sibelius

Tchaikovsky and Frank Zappa
Bach, Mozart, Beethoven and for piano Chopin.

Bach and Mozart are, for me at least, a notch above all others.
From 30 plus years of listenning: J.S.Bach Ravel - complete piano works Debussy- ditto Grieg- Lyric pieces Brahms Rachmoninoff Poulenc,Satie, Barber, Puccini, Charles Griffes, Chopin,Edward McDowell AND ! current new find Gavin Bryars
In no particular order, and not complete: Bach (& sons), Vivaldi, Copeland, Stravinsky, Vaugh Williams, Ravel, Handel, Tchaikovsky, Sibelius, Gershwin, Debussy, R. Strauss...

Really, I wish I knew much more than I do about 'classical' music. I'm not as big on Mozart, Beethoven, Brahms, etc., or piano music or opera, as I am on early music and 'modern' (20th century) music, but most of what you hear is high classical and romantic period warhorses. I'm not much of a concerto guy either - I like chamber or full orchestral pieces better. I enjoy listening to Minnesota Public Radio's "Music Through the Night" on my local NPR classical station for less often heard fare.
Bach, Morton Feldman, Stravinsky, Miles Davis. Chopin, Cecil Taylor, Bach again, Brahms, Mudarra, Michael Tippett, Charlie Parker. Django Reinhart, John Cage, Pauline Oliveros, Rachmaninoff. Others.
Swklein, thank you for pointing out that the question did not stipulate "classical" - something I overlooked after reading through the posts before mine. Although I myself do make the distinction between composition and soloing (Parker, Reinhart), thanks as well for bringing up the idea that some arranging and soloing can be thought of as composition. Staying within the paragdigm of "serious" music stipulated in the question (a term I understand but resent, and don't use myself), let me add to my little list: Ellington, Mingus, Monk, Coltrane.
Mozart,Haydn, and Beethoven String Quartets....
Over the past few years, I've come to absolutely admire Dvorak in his ability to consistently compose pieces that I love. The symphonies (esp 7-9), cello concerto, violin concerto, string symphonies, etc are fantastic. He has become my favorite composer.

#2 in terms of consistently good works has become Mendelssohn. I still adore Brahms, Tchaikovsky, Prokofiev, Sibelius, and Rachmaninoff.

The responses are quite interesting. Only one or two contempory (currently living and composing) composers! Many of the favorites are well over 100+ years old.

My fovorites include:

Part, Mozart, Bach, Vivaldi, Tavner

decided to bring this one back to life........
Mendehlsonn(especially the violin concerto w/Heifetz), Beethoven, Schumann, Bruckner(symphonies, selectively), Bruch(violin concertos), Brahms, Dvorak(everything), Puccini, Mahler(all symphonies), Elgar(everything), Barber(violin concerto), Copeland(clarinet concerto), Corigliano(clarinet concerto), Glazunov, Saint-Saens(cello concerto, violin concerto), Prokofiev, Shostakovich(absolutely everything), Rachmaninoff(piano works).
I have to reply because nobody's mentioned Verdi! :) I adore a lot of things he wrote, including but not limited to Simon Boccanegra (just get Abbado's on DG, it's the perfect performance), Rigoletto, Macbeth, Aida, La Traviata, Il Trovatore, Requiem, and, and.. Hehe..

I also love:

- Puccini (almost everything)
- Mussorgsky (Boris Godunov is stunning, get the Karajan version on Decca)
- Borodin (Prince Igor! The Polovtsian Dances is pure magic)
- Rachmaninov (Vespers + lots of other things)
- Dvorak (just hear the cello concerto! Get the Helmersson/Jarvi version on BIS!)
- Arvo Part (one of the few modern composers I like. I'm very attached to Alina right now)

.. and many other things too! :)
Don't know how and why, but I forgot to mention Tchaikovsky in my prior post.
Mozart, Beethoven and Danny Elfman.
Not necessarily in order, my favorites are Brahms, Dvorak, Sibelius and Vaughan Williams, followed by Schubert, Tchaikovsky, Mahler, Bruckner, Mendelssohn, Beethoven and Shostakovich. Forced to choose an absolute favorite composer, Brahms. Favorite symphony: Dvorak's Eighth, but Brahms' Third and Fourth are close. Favorite concerto: Brahms' Double for Violin and Cello and Dvorak's Cello (tie). Favorite overture: Wagner's Tannhauser (the more imposing Dresden version). Favorite song/sung by: Nat King Cole singing Stardust.
I'm also checkin' on that actually. Not too many music lovers know that there are quite a few composers that are alive and create a great music different from 100+ years ago but still you can realize the craftsmanship and standards opposing an improvisation and rather having a strict structure similar to a few centuries ago...
A few more living ones: Michael Nyman -- Check out "The Cook the Thief, His Wife and Her Lover" soundtrack and many more of his works...
Philip Glass; John Lurie for movie soundtracks; Roger Eno for his amazing solo piano works, H.J. Roedelius goes along...
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Seems to be a real dearth of French composers here. How about Rameau, Couperin and Lully for Baroque? Also a fan of Henry Purcell, Ralph Vaughn Williams and Schubert.
BTW: I attended a solo recital by Astor Piazzolla on bandoneon.
In the spirit of your post, blasting song after song I would add to many of the above a few 20th century composers of popular music much of which is timeless.

George Gershwin
Duke Ellington
Antonio Carlos (Tom) Jobim
Richard Rodgers
My top 15 
Josquin Desprez
Richard Strauss
Vaughn Williams
Beethoven, esp. string quartets, piano sonatas, odd-numbered symphonies
J. S. Bach
D. Scarlatti 
Bartok (esp. string quartets)
John Dowland
Stravinsky (esp. "L'Histoire du Soldat")
J. Turina
M. Ponce
M. Castelnuovo-Tedesco

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With apologies for spelling

Benjamin Britten
Vaughan Williams
Einaudi (contemporary)
Archangelo Corelli
St. Saens
It’s been over nine years since I last listed my favorites. But, in my entire life, it wasn’t until about a year ago that I came to greatly appreciate two composers whose music I had never really cared for---Mozart and Haydn. It all started when I was hit as if by a bolt of lightening out of the blue by Mozart’s "Hoffmeister" String Quartet (#20). Hard for me to believe how for so long I just could not stand this composer. From the "Hoffmeister", I skipped to other Mozart chamber works...and then I started listening to Haydn’s Piano Trios, etc. Astounded again. Based on their chamber music alone, these two composers now sit atop my favorites list along with Brahms, Dvorak, Debussy, Ravel, Tchaikovsky, Borodin and Schubert.
Did you discover a love for bluegrass at the same time? :) 

Not being completely facetious, I usually hate bluegrass and Mozart for the same reasons.


Can't get into Baroque...math turned into music.  ugh

Mozart and Beethoven symphonies, concertos etc.  All transcendent.

All the Russians...so emotional, based on the nation's history it's not hard to see how that would be.

THE favorite is Dmitri Shostakovich!  His 5th symphony is perhaps the most moving piece of music I've ever heard.  I own and listen to various interpretations which reveal different aspects of Shosty's complicated psyche.

Erik...My knowledge of and experience with bluegrass is virtually nonexistent, so I can’t comment on it even in fun. However, I used to mock Mozart by referring to his "snuff box" music. Then, when one day out of nowhere, I found myself attracted to his chamber music, I experienced a sense of cognitive dissonance. I had to tell my mind it was okay to have positive feelings about Mozart despite all the years I had previously felt otherwise. Frankly, I’m still not especially fond of his symphonies, though I do enjoy his piano concertos.

hfiman...Of course, Shostakovich is an entrely different kettle of fish relative to Mozart. Though not quite in the same company with my personal favorites, I do admit he can certainly press other buttons of satisfaction for me. That "complicated psyche" (as you say), with its dark, probing aspects and occasional shafts of sunlit hope can frequently have a riveting effect on the mind and spirit. There was a time when, perhaps like some others, I found his music too dreary. Then, one day, as with Mozart, my feelings were transformed. I was suddenly able to experience Shostakovich in a new and fascinating way. My favorite among his symphonies are the 4th, with Kondrashin (lp) and Jarvi (cd), and the 7th, with Kondrashin (lp) conducting. I also enjoy a fair portion of his chamber music.
I find bluegrass and Mozart equally giddy, but you are right, not all.  His violin concertos are sublime.

The only time I've heard bluegrass and liked it was with a supremely talented violinist.

I wonder if anyone living within a driving distance of a Cathedral managed to approximate the sound of organ at home. Listening to live Bach is surreal, but on my home stereo it is just OK...