This roughly 80-minute piece was commissioned by the Kronos Quartet and written with them and pianist Aki Takahashi in mind as the performers; they premiered it in Los Angeles in 1985, and recorded this version in 1993. It’s a breathtaking record, the two elements of the title working in unison but not together — the strings release long, slow chords as the piano offers single notes, or short figures of between two and at most six notes, all swathed in shimmering reverberation with the sustain pedal held to the floor throughout. The tiny variations on a very simple theme make you feel like you’re picking up leaves one at a time and staring at them, noticing their differences and their similarities.