Here is a short list of tracks I use when auditioning gear. Hopefully you use at least CD quality to get the full impact of these tracks. Enjoy!
Steve Gadd Band - 70 Strong CD - Blues for..., Desu, Sly Boots, Dukes Anthem.
Michael Hedges - Strings of Steel CD - Ragamuffin.
Stevie Ray Vaughan - Couldn't Stand the Weather CD - Tin Pan Alley