If someone looked through you music (records, CDs, etc.) what would surprise them?

This actually was a bit of a happening with a friend.  In looking though my...special pressings, gold Cds, SACDs, and other esoteric "software sources" he was surprised at the Rosie Clooney ones.   In her later life she did some CDs of "standards" and she nailed 'em. 

Hopefully nothing. That would mean they haven't pigeon-holed me into predictability.
A lot.  My tastes are all over the place.
Just the fact that I have so much of it would probably be the first and biggest surprise.  I don't wear headphones around all the time (or any of the time), and I rarely talk about music at all.  I think it would come as a surprise to just about everybody that I listen to music as much as I do.

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Not defining "someone" makes the question tirival. Even if it were I wouldn't know how to get inside of "someone's" head.
Well fuzz, I can see why you would say that. 

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Its possibly more an indictment of them rather than me.
Well fuzz, I can see why you would say that.

>chef's kiss<
Rather than any type of kiss, it is an acknowledgement of the obvious.  

I can also see why most politicians say what they say. 

The total lack of even a single Zappa or Grateful Dead album
(zero presence of either)
Lots of NWOBHM 7”’s 12”’s, LP’s
  did a lot of trading in the early 80’s.
had several trade buddies in Europe, 
ide send some cassettes, records, etc, in return I would get a lot of rare British rock/pre-metal stuff.

 Still have most,still in touch with my friends across the pond.
Considering I listen mostly to Classical:

Michael Jackson
For me my musical taste goes everywhere with the majority of my collection centered around R&B, Rock and country but the lack of not one offering from Frank Sinatra surprised even myself and I need to rectify that. Enjoy the music
That most of my music they wouldn't know the artists or the music. I have lots and lots of what few people have ever heard of.
The amount of cat hair?

What's funny about that is, I bought a record from a guy one time supposed to be "Hot Stamper" quality and that is exactly what surprised me too, the amount of cat hair.
Cats seem to be into analog.  I bought my Gyrodec SE from a guy who was selling it because his cats couldn't leave the platter weights alone.
Wait, I thought cat hair on a special pressing LPs just gave them  more.....ah, you know, texture? 
The last cat I had would sit for very long periods of time trying to "catch" the cursor on my computer monitor...sometimes on the front of the screen and sometimes on the back...  more than once I lost a mouthful of coffee onto the screen from laughing. 

That after 2 hours they are thinking they should have brought a lunch.
The number of cd's makes their heads spin so they can't choose.
In the approx. 1300 classic rock, jazz, blues, etc. lps they'll find a nine pack of Michael Jackson seven inch 45's.  Can't remember where they came from.
That most of those to whom I listen are no longer with us. 
The Black Mamba when it strikes.  Just kidding. Really.....
-Only one Pink Floyd album, Wish You Were Here. First Japanese pressing LP.
-Five LP copies of Bitches Brew by Miles Davis. Two Japanese, three US, all original pressings.
With over 1000 CD's and >1250 vinyl recordings NO Bob Dylan/David Bowie/U2 or Prince. 
@dayglow no Bowie? Blasphemy! Haha! Yeah, being a drummer, most of my music leans on the rhythm side with some great musicians and particularly drummers. But, they would be surprised by the wild variety of different styles.
Holy crap ,you have a lot of stuff....you still listen to this ? Why ?
Probably the odd mix of music, CCR, Death SS, Kreator, Celtic frost, Pat travers, mr. Big, Yakuza, trust, forbidden, Clarence brown, Johnny winter, b b king, humble pie, venom, Jenny Darren, Melanie, bathory, the accused, the Beatles, frank marino, the temptations, wishbone ash, napalm death, riot, John Denver, Rob dylan, exciter, dead horse, queensryche, status quo, Elvis, beach boys, grand funk railroad, Samson, American dog, and 400 more bands.
  I love a good variety of tunes, during different times of the day, or my mood , also, we entertain family on weekends many times, so we play the:doors, Rob seger, the stones, killing joke, all kinds of stuff, and once in a while I’ll put on a song by zoetrope, or hear, just to mix it up a bit. 
   We have a large variety of music, and try to get to listen to a lot every month, when we have downtime, but there’s always something to do.cut grass, trim shrubs, change oil on lawnmower, cars n truck,  so when I hit the couch, I like my system nice and toasty when I sit with a dram or a frothy hefe-Weiss. 

Surprised by the breadth and depth of blues and jazz owned by a white kid from “Mud Spot”, Wyoming.  My jazz director was from Vegas and played the big hotel casinos when that was the thing.  What a blessing.
The numbers of the same album (although different manufactures and pressings) but the same nonetheless.
That I've got the complete collection of all Grateful Dead live box sets, even though I'm mostly into heavy rock, punk, post-punk, indie, prog-rock, reggae, and even some hip-hop.... 
That there’s no CD’s, ripped to a drive, backed up and given away. That the LP collection has a few oddities like Steve Martin, George Carlin and (depending on your mindset) The Fugs.
The amount of money spent
That I have diverse taste.