my taste is... eclectic. having a shuffle, i'll just load it on random and these are the sorts of groups that come up:
underoath, haste the day, queen, dean martin, LAGQ, coldplay, jars of clay, switchfoot, thin lizzy, the beach boys, the benjamin gate, beloved, beethoven, cheap trick, david crowder, frank sinatra, derek webb, john reuben (proof white, jewish boys can't rap... but they can make you smile), klank, lifehouse, melee, some random monks chanting (a description, not an actual title), plumb, skillet, smalltown poets, soeur sourire, TMBG, and so forth.
each genre and each song creates a very different sort of feel and approach to training...