(1) realplayer, easy to use: good for organizing, listening or ripping, and burning. i organize all music here.
(2) windows media player, fairly easy: not so easy to import, great for submitting compilations, or obscure albums. excellent mini-player. my listening player.
(3) rhapsody, easy to use: doesn't hold on to files if you move them around, easy to listen or burn. i listen to D L here.
(4-5) I-Tunes & Nero, don't use either yet, but i'm trying.