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...It is based upon songs, which consist of a title, lyrics, an optional author and a copyright. Other features include albums, topical categories, user favorites, and attachments (mid ,pdf, mp3, mus).
MUS is a cards game with 4 players around a table. It is a spanish (basque) game. Easy to learn to play but hard to master. Important to decoy opponents. SUMUS is a server for such a game. Clients are also provided or in development.