R_f_sayles is giving you sound advice. Take recordings that exemplify the specific virtues and nuances of musical reproduction that are most important to you. It's fine and even encouraged to torture your prospective purchase with a challenging base line, etc. But don't abandon musical involvement for the more easily attained "Wow did you hear that" some dealers so deftly evoke.
To test all aspects of the speaker you need several discs (or LPs). Organ, Trumpet, Piano, Violin, Full orchestra, and, of course, the ubiquitous female vocalist.
When I was shopping speakers I made a CD expecially for that. I picked some Jazz, Rock, Classical, Drum Solo, Female Vocals, etc. I found it gave me a reference point on each speaker.
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