MediaMonkey

 This program will replace all the crap you don't need like Windows Media Player, iTunes and a few others. This program has it all, just get it and see. The free version of MediaMonkey has more than enough features to qualify it for this blog but I could do a whole other blog about the paid version! I can't say enough great things about this excellent program. If you have an iPod or other portable listening device, this program will work with it. If you have a massive music collection this program will work with it. If you have a lot of badly tagged and organized music this program with help with that. This is the best audio player you will find. If you want to play video use VLC!

From their site:

MediaMonkey: The Music Organizer for Serious Collectors

Manage small to very large collections of audio files and playlists (50,000+), whether on a hard drive, network, or CDs. Lookup missing information and album art online, tag almost any audio format, and automatically rename/re-organize tracks on your hard drive.