Generator sequence

A generator sequence (GS) is a cyclically repeating sequence of stacked intervals. A GS can be denoted:

GS(interval1, interval2, interval3, ..., intervaln),

which means: stack interval2 on top of interval1, interval3 on top of interval2, etc. up to intervaln, then stack interval1 again and repeat.

Generator sequences generalize MOS scales and are often used to create higher-rank scales.