Top 3 songs to evaluate a system

I do the 7.4 version. You are surrounded. This disc is about as good as it gets. Its recorded in Dolby DTS and its recorded excellent. Five thousand watts , Four killer subs, and a complete Legacy system. Chest thump is better than being there. I set volumes at 105-110 db. But it really doesn’t seem overly loud. Just penetrating, and crisp. Problem is, its a two hour concert and whoever your showing it off to absolutely wants NO part of leaving until you have played the entire concert .. Last mans wife said (as she sunk into that couch with a nice drink in her hand) "Am I in heaven? Did I just die and go to heaven? .. Lol

https://www.dailymotion.com/video/x2uu90z

https://youtu.be/2AclvpiMX6A

great thread...lots of new listening ideas!  My top 3:

vinyl - Dead Can Dance - Ubiquitous Dr Lovegrove - great percussion for transients and speed
Depeche Mode - Dream on - acoustic guitar and harmonized vocals for critical listening
digital - Marion Herzog/Chris Jones - No Sanctuary Here - incredible bass test for detail and resolution in the low range

Great topic, tough to choose just three so going with three from 3 different genres:

Classical:

Mozart Divertimento K.563 Cummings String Trio on Meridian (CD). Great for assessing string tone and ability to distinguish musical lines

Mozart Piano Uchida Live Phillips (CD). Great piano tone and hall acoustics. Check out the Adagio which is the final track. 

Brahms Violin Sonata Abel Wilson (LP). Great all around chamber music recording

Jazz:

Patricia Barber "Nightclub" Autumn Leaves. (MOFI LP) Great acoustic bass and super clean vocals. Good test for excess sibilance.

Sonny Rollins "Way Out West" (Acoustic Sounds LP) "Old Cowhand" Great live drum feel and sax immediacy. 

Linda Ronstadt and Nelson Riddle "What's New" (MOFI LP) I love the final cut "Goodbye" which is great for vocal texture and immediacy.

Rock (ish):

Fagen "The Nightfly" (MOFI One Step) and "Morph the Cat" (LP). Love the title track of the former for system drive and projection--if your feet don't move your dead! The bass guitar in Morph the Cat goes super deep and you should be able to follow the line clearly throughout the song.

Shelby Lynn "Just a Little Lovin". (Acoustic Sounds LP). The title cut is killer--yes, the kick drum should hit you in the chest but I mostly listen for the rim shots on the snare at the start--they should reverberate and echo in the studio with real percussive shock.

Nick Drake "Pink Moon" (Island LP Reissue). Great percussive guitar sound, should be able to really hear the intricate work and fingering. Pretty good for vocals too! I'll also throw in Michael Hedges "Breakfast in the Field LP and Alex Degrassi "Slow Circle" for great sounding (but different) acoustic guitar recordings. 

I'll force myself to stop.....

Late 60's Joni Mitchell.  Excellent, intimate.  The timbre of her voice, the superb guitar.  Both hard to record properly as well as a playback system to come close.  Later with Jaco pastorius should sound live.

Dreams Fleetwood Mac.  Instrument separation, voice, drums
Dallas Wind Symphony Trittico:  dynamics, drum playback, concert hall presence, horn reproduction, depth

Kraftwerk:  3D Katalog.  Space, dynamics, bass, depth,

First, I enjoyed reading everybody's choices...some were not really expected. Second a few years ago a friend of mine  passed away and he always used Diana Krall's (Paris Album) to test speakers, amps and DACS. The specific cut he used was "A Case of You ". If you can't hear piano frets being released, Diana moving aroound on the piano stool and her mike changes and most importantly at the start of her song the different postions of the audiance members caughing  you need to focus grass hopper".