Complex sentence: "While I Was Walking, I Heard a Sound" is scored for 120 singers, spatialized in balconies of the concert hall, where three choirs and 9 opera singers are making bird calls and environmental sounds.
Split into simpler sentences: While I Was Walking, I Heard a Sound is scored for 120 singers, spatialized in balconies of the concert hall. During one movement, three choirs and 9 opera singers are making bird calls and environmental sounds.