Winamp, mainly because it's highly costumizable for a desktop modder like me, pair it with cd art display and you get a nice combo for listening to music without hindering cpu performance, all the while being visually appealing.
ohh...wrong kind of music player |D derp Windows media player :3
The world is too much with us; late and soon, Getting and spending, we lay waste our powers; Little we see in nature that is ours; We have given our hearts away, a sordid boon! Kyonko is best waifu <3