Red Hot Chilli Peppers -- Californication
Im kidding. Thats an example of what NOT to use...lol.
Its recorded terribly. Listen to it to see why its recorded terribly.
Heres some CDs i use :
Radiohead -- The Bends (All around reasons, stage,dynamics,see if it gets congested with alot of things going on at once, etc)
Pink Floyd -- Dark Side of the Moon (All kinds of sounds to listen for,little things way in the distant backround to listen for that "open window" )
STYX -- Mr. Roboto (dynamics and punch)
James Taylor -- You Got a Friend (follow the constant bass line)
Rush -- Tom Sawyer (Dynamics,Punch)
David Sanborn -- Best Of David Sanborn(Detail, Separation)
Bella Fleck and the Flecktones -- Flight of the Cosmic Hippo(Bass)
Lisa Loeb -- Firecracker(vocals, stage)
I also use some Techno to test how it sounds louder, and for speed, etc.
Primus -- Sailing the Sea of Cheese (All kinds of stuff going on and well recorded)
BB KIng -- Any of his live tunes because you can hear the venue it was recorded in and get a feel for stage and also to listen to male vocals, although he also did duets with females to listen to.
I also have a drum track i use from a sound effects CD thats awesome, and lots of other music.(Drum Track for Punch,Wack, Slam, Realism)
There are so many others, but maybe this will give you some ideas.