MediaMonkey is a full-featured multimedia files collecting and managing software, integrating music file managing, recording, converting, burning, playing and tagging in one place. It supports all common audio formats, as well as M3U (playlist) and CD track. To many music lovers, MediaMonkey is absolutely one of the best audio library managers (especially for lossless audio files).
If the music files in your computer are so messy that you can't or are too lazy to classify them, then you might as well try this application that claims to be the only and real music file manager - Helium Music Manager. It versatile and humanized design makes users open minds and eyes.