mp3wrap - 0.5-4 main

Command-line utility that wraps multiple MP3 files into a single, playable
MP3, without losing filenames or ID3 information, and without reencoding. Also
supports archiving non-audio data such as playlists, info files, and cover
images inside the MP3. These files can be unpacked later (using mp3splt, e.g.);
ordinary MP3 decoders can play the entire audio stream as one long track.
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This is a free, independent alternative to AlbumWrap:
http://www.infamus.com/albumwrap/