The Sunday Boston Globe has a feature on the Bohlen-Pierce music system, a system of 13 equal steps where the high note is three times the frequency of the low note on the scale. Invented, or probably better described as discovered in the late 1970’s, Bohlen-Pierce is moving out of experimental electronica and into more traditional musical realms. New instruments are now available to play music using this system. A good example of a Bohlen-Pierce clarinet sound may be found on the Globe site. More examples of music in this system can be found here.