This scale uses A-L instead of sharps and flats, for mathematical consistency. The frequencies of notes are based on exponents of 2. A8 is 2^(8*12)/12 Hz, B8 is 2^(8*12+1)/12 Hz, C8 is 2^(8*12+2)/12 Hz, and so on. These frequencies end up being close to right in-between traditional notes.