Gloria Coates’s personal sound-world is unlike any other in contemporary music. Her Piano Quintet is rooted in the poetry of fellow American pioneer Emily Dickinson, with half of the quartet tuned a quarter-tone higher than the other, the strange beauty of the music emerging in glacial landscapes and shimmering microtones. Coates’s Symphony No. 10 evokes the archaeological ruins of a Celtic tribe, inspiring a torrent of dramatic percussion and long held tones that curve and shake in a moving body of sound.