Music Minus One (MMO) was an American educational music company founded in Westchester, New York. The company released play-along albums intended to accompany a melodic instrument or vocalist as an aid for practice and music education.
Music Minus One (MMO) was an American educational music company founded in Westchester, New York. The company released play-along albums intended to accompany a melodic instrument or vocalist as an aid for practice and music education.
Source: Wikipedia "Music Minus One" · CC BY-SA 4.0
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