Ideal for beginners, is the 48 bass, usually with 6 rows of 8, allowing accompaniment in the keys of Bb, F, C, G, D, & A. The treble of the 48 and 12 basses usually has 26 keys, just enough for most tunes. A 120 bass with 41 treble keys is the full size model, The bass gives a chromatic scale, and all the chords, in 6 rows of 20...
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