Today’s date marks the shared birthday of two of America’s most famous “maverick” composers, both hailing from California.

June 24, 1901, is the birth date of Harry Partch, an Oakland native.

Partch devoted his life to developing an alternate system of tuning, instead of the conventional Western system of equal temperament used, say, on pianos. In Partch’s harmonic world, microtones were welcomed. To play his expanded scales, Partch designed and built new, exotic instruments with colorful names like “marimba eroica” and “cloud chamber bowls.”

For Partch, music was a synthesis of theory and theater, ritual and dance… intensely physical in nature and best experienced live and in person. Harry Partch died in San Diego in 1974.

Another Californian, born on this date in 1935, is Colfax native Terry Riley. It was in San Francisco in 1964 that Riley’s most famous piece, entitled “In C”, received its premiere. The score consists of 53 phrases, or modules, with each player freely repeating each phrase as many times as desired before proceeding to the next.

The result is an unpredictable, unique music work of canonic textures and polyrhythms, capable of being performed by any group of instruments ranging from a marimba ensemble to a full symphony orchestra. As the title indicates, the piece is resolutely in the traditional key of C Major, and is now regarded as one of the seminal works of the so-called “minimalist” movement in American music.