I don’t audition gear with great frequency, so my "auditions" are limited to specific component upgrades. In other words, I’m not cycling through components so the music I use for evaluation is the music I enjoy listening to. I don’t use any of the traditional "audiophile" tracks most will list. Just a preference. I will use The The’s Dusk album and any of Neko Case’s albums as both provide a good opportunity to see what the new equipment "reveals."
I’ll then move on to listening to select ambient, electronic, blues, jazz, funk, classical tracks or full albums by Depeche Mode, Chet Baker, the Police, Radiohead, Talking Heads, New Pornographers, Calexico, etc.
I think that my "test" music should be the music I listen to the most across a wide array of genres and not limited to specific tracks or genres. I want to enjoy all of my music not just one song or one album. Can the equipment make a mediocre vinyl repress of Hank Ballard & the Midnighters sound good? If so, then the rest of my collection will sound good. Will it reveal something on the colored vinyl pressing of Calexico’s El Mirador that is more present in the FLAC file? Then there’s a good chance everything will sound better. Rarely have I had an upgrade make a bad recording worse. It might reveal the shortcomings of certain albums but certainly not to where I would stop listening to certain albums.