It's really not infinite, if you have 12 possible notes and 8 are played in a row that's 429,981,696 (12^8) possible melodies. That includes melodies with the same note in a row eight times; as such, if you require a note change each time you have 233,846,052 (12*11^7) possiblities. This still allows for half step variations (B - C - B etc.). So if you require whole step movements you h
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