Like a lot of people here, I like to listen to the music the way it was recorded. For instance, DSOTM was recorded in 'quadrophenia' or 'Q-sound' so it's best to be hear on FOUR speakers.
I like DVD-Audio's and SACD's too. The sound is much better - no compression at all - and most (not all) recordings really sound nice using all your speakers, and is a nice diversion from standard 2.0
So I guess I listen to everything no matter what. Since I invested in a 5 channel receiver, and an amp, and 3 additional speakers, it is nice to use them for as many applications as possible. Though I know a lot of people here buy separate two channel systems just to listen to music only (many choosing tubes of course for amplification and even source).
Most of my two channel right now is done through Headphones and an Headphone amp (tube amp of course). Sounds fantastic, I don't bother my wife or son (usually listen when they're in bed) and the detail/smoothness is incredible.
Funny, though it's "two" channel, the sound envelopes you, kinda like my SACD's and DVD-A's do when listening in 5 channel (with a lot more bass of course).
Food for thought is all