WinAmp

iTunes

There are a lot of free music players for Windows, including Windows Media Player, which is perfectly adequate for occasional use. Music junkies, though, want something more. Whether you prefer iTunes or WinAmp depends on your specific needs.

If you want something unobtrusive, yet powerful, go with WinAmp. It's perfect for using while doing other things on your computer. I particularly like the global hotkey support that lets you control it while you are still working in another program. No need to switch focus.

If you want something to help manage a large music collection, or if you plan to buy songs online, iTunes is unbeatable for ease of use, elegant interface, and powerful features.

http://www.winamp.com/player/

http://www.apple.com/itunes/