It really makes no difference what you use, as long as you're very familiar with it on your current system. Pick CD's (unless, of course, you use LP's as your primary software) that test all frequencies and those whose transient "speed" and decay are likely to be apparent. My own test discs include: Burmester "samplers" (Vorfurings) 2&3; Jennifer Warnes, Famous Blue Raincoat (Canadian pressing); Copland on Telarc (CD-80078); Stravinsky, Histoire du soldat (Chesky CD122); The Fi/Analouge Productions Sampler; Cowboy Junkies, Trinity Sessions (Classics reissue Gold-RTHCD8568); Eric Clapton, Unplugged; and, Garcia/Grisman, Not for Kids Only. All of these Cd's are very well recorded, though some are a bit difficult to find. The 3 samplers have a wide array of music and are the best portable library I've found to test every link in a sysytem.
Auditioning tunes
I'm looking for personal opinions on the best tunes for auditioning speaker's. Classic Rock up to pop as well as some Classical, and even some New Age. One song I'm thinking of is Elton John's (Funeral for a friend-Love lies bleeding), organ piano, guitar, and good vocal's, should show me the full range. Also Pink Floyd's (Pig's). Any other ideas would be appreciated. Thank's