Pavel Kounitsky presents a new FREE conceptual player called Quisple player. Quisple plays any song you type right away(!) (uses youtube to stream from), so basically you can play ANYTHING instantly. Just type an artist and a song name and Quisple will play it immediately.
It has a nice feature of playlist managing and sharing, and it is all compact and simple.
Quisple is a freeware and distributed free-of-charge. I don't know which systems it works on though..
"Quisple player features a new way of listening to music. The idea is to give you a player that would play any song you want with a single click" Pavel Kounitsky
Update: The player works on all Windows systems.