[F12!] Factor 12! is a group for experimental composers working in mixed theoretical media to create new styles of music for discovery, pleasure, fun, profit & notoriety.

"There are 479,001,600 (12!) possible combinations of the 12 tones of the chromatic scale. With rhythmic variety added to the unbounded universe of melodic patterns, there is no liklihood that new music will die of internal starvation in the next 1000 years". ~ Nicolas Slonimsky

Not that we should be limited to merely 479,001,600 possible combinations & permutations, but it is a start.