MediaMonkey is an easy-to-use organizer for serious music collectors.

It catalogs your CDs, MP3, WMA, and OGG audio tracks, and looks up and intelligently tags and renames/reorganizes them. It rips CDs, converts audio file formats, and easily creates mixes. It integrates with Nero for CD Burning, and with Winamp for playback. It even includes a built-in player that supports hundreds of Winamp plug-ins, and automatically adjusts volume levels so that you don`t have continually fiddle with the volume control.

Best of all, it`s free!

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