4-MP3 is a database created for a storage and search of the information on the collection MP3, WAV, VQF and other sound files. If you have one thousand or more files with music, 4-MP3 will help you precisely to know, that you have. 4-MP3 includes powerful TAG editor, supporting mass edit operation. The unique module Mass Rename will allow you to rename files under any law. You can easily convert TAG to Filename and back. Mass Rename supports all known and unknown ways of renaming files!