Tonality - Human Voice. Male or female, It shouldn't sound tubby, chesty, cupped, or nasal, Emmy Lou Harris Eva Cassidy, Aaron Neville, Mark Knopfler (His voice turns to mud on a lot of systems)
Dynamics - A big symphony, Beethoven's 9th is the first that comes to mind
Detail - Acoustic guitar. Pat Metheny and Charlie Haden. "Beyond The Missouri Sky"
Soundstage - Any well recorded live album, regardless of genre, classical, jazz, rock. Dan Hicks "Where's The Money" on a goodsystem will put you in The Troubador circa 1972. The first time I ever heard Magneplanar Tympani IIIs biamped with Audio Research D-76s and D52s with this album was life changing.