Alternative to iTunes?

Winamp!

Foobar. It's one of the mandatory programs I first install after a system wipe.

Doubletwist! You can even import your library from Itunes :)

Aimp 3

MS paint

MP3 Rocket

Spotify is great, i use it daily. You can import playlist from itunes also.

ifunbox :) best for me http://www.i-funbox.com/

MusicBee is awesome. Pretty easy to configure, pretty, functional, can rip / encode and plays basically everything. It emulates most Itunes functions save for the store, ofc, and is compatible with Winamp plugins. Got it playing right now and it's using 32MB of RAM.

You'll need a couple plugins for it to encode and play in some formats, but those can be downloaded from their site, just can't be included with the program for licensing reasons.

foobar

youtunes

MediaMonkey is my favourite. Being able to organise all media (music, movies, tv) in a consistent format (after tagging from Amazon) it is second to none.

Gold also has a DLNA server built in which is handy for smart tvs.

I like iTunes personally.

Foobar2000. Piss easy, low resource usage, tonnes of plugins, etc. You must be willing to sacrifice aesthetics, though. But you can install a wide variety of themes that could make it look just like for example iTunes.

Songbird

if you are lazy you could always use windows media player. however i like media go (i have a lot of Sony products :P)

foobar

uTorrent

I like JetAudio.

I second DoubleTwist, if you want to sync with a phone or something. Otherwise, use aTunes. Pretty easy to use and search for what you want to listen to.

Windows media player ?

Foobar or MusicBee, trust me on this one...

Note: Foobar seems to have an issue on Windows 8 for me, just a heads up, MusicBee works great.

Zune

Clementine is pretty nice. It's cross-platform and what I use on my Linux system.

I like Banshee for music, but the Windows version is a "alpha-quality technology preview", so contains many bugs and is not recommended. It works well on Linux though, and will hopefully be improved on Windows, so that those using Win can use it.