If you like the look and feel of iTunes, but don’t like it’s ‘take over your system’ style approach, an alternate you might want to take a look at is the open source aTunes.

aTunes is a full-featured audio player and manager, developed in Java programming language, so it can be executed on different platforms: Windows, Linux and Unix-like systems, …
Currently plays mp3, ogg, wma, wav, flac, mp4 and radio streaming, allowing users to easily edit tags, organize music and rip Audio CDs.

For the most part, aTunes handles all the player functions you would expect but has a strikingly similar look to iTunes. As stated, aTunes works on any OS so if you are looking for a music player, give it a try.