The MP3 music compression format represents a lot of interesting challenges for eager developers. Who hasn't thought of indexing their mp3 files and store the result in a database? :)
[>] ID3v2
An archive site for ID3 information, including, but not limited to, specifications, various implementations of readers and writers, and code samples.
[>] Mp3Info
This library will retrieve all the information you can find in an mp3, including encoding properties (bit rate and frequency range) and song information (id3 tags).
[>] Visual Basic & MP3
This site contains a lot of gems on how to work with mp3 files from Visual Basic. The list includes playing the file, presenting info real-time, creating audio files, encoding and decoding mp3 files, etc.