The score is punctuated by a kind of signal: two pianos, tuned a quarter tone apart, arpeggiating upward into silence.

It is a granitic 36-minute score that begins with a little fanfare from two pianos placed on either side of the orchestra and tuned a quarter tone apart.

In these, he advocated for quarter tones and dreamed up a double concerto for two soloists playing in different keys — a century before Ives.

But then teachers introduced her to Indian ragas, Gamelan music and compositions with quarter tones, unfamiliar modes and atonal structures.

I went through all the different possible fingering patterns, and then put together multiphonics, quarter tones, and so on and so forth.