What music do you want to play really loud?

I'll gladly 2nd the Floyd but animals instead dogs in particular

Easy. Mahler's 2nd Symphony (with the ending of the 8th close in the running).
Recording? Not so easy. I have about 8 different versions, but probably because it was the first version I owned, I still prefer Bernstein with NYP. The louder the better!!

Honky Tonk Women by the Stones. First I play the original studio cut, then I follow with the live concert version from Get Yer Ya Ya's Out. That first guitar chord on the concert version is really killer, especially cranked way up like a concert performance.

The 1812 Overture.