MP3 Cat 2.21
This database helps you get your music files organized and keep them in order.
Apart from MP3, it also supports WMA, OGG Vorbis and Monkey's Audio files.
You can group files by artist, album, genre or your own categories. There's no limit to the number of categories and subcategories you can create. This even reads and lets you modify ID3 tags either one at a time or in batches.
You can search the database using keywords and wildcards. Plus, it supports the production of WinAmp playlists and lets you play or add selected files directly to the WinAmp queue.