Goldie,
Interesting topic! Haven't had cause to do this for a while but will (hopefully) be auditioning some phono pre-amps in the near future so plan to dust off some of my vinyl favourites
Anyway, my choice of hi-fi test tracks runs something like:
Bass: J-M Jarre - try "Oxygene 11" which starts off with a crackling synth bass to test the speed and bass responsiveness of any system. I've discounted several choices of speakers in the past because they just weren't capable of keeping up!
Vocals: Kate Bush - pretty much anything but I particularly like "The Dreaming" as it's got some wonderfully off-kilter vocal styles. Alternatively try anything by Annette Peacock, e.g: her "X-Dreams" album or her vocals on Bill Bruford's "Feels Good to Me", for some
really lucious vocal tones!
Imaging: Interior (Japanese duo on Windham Hill label) - the album "Design" has some near holographic imaging which I'd never before heard coming off a lump of vinyl (might, unfortunately, be difficult to find nowadays)
Resolution: Early stuff by Adrian Legg or Michael Hedges - although it's predominantly acoustic guitar - try and find Adrian's "Kalahari Blues" track from the "Technopicker" album (the best version of this track) or Michael's "Ariel Boundaries" album. It's partly about the imaging but partly about the detail of the fingering of every note
I'm sure I could dig out some more but these work for me as indicators of a system's strengths or weaknesses.
Cheers
Dave