Coplas is a short anthem for voices and belongs to a much larger work called 'Last Rites' which is based on the mystical idea of St. John of the Cross. In once sense Coplas is a prolonged decoration of the 'et sepultus est' cadence from the Crucifixus in Bach's Mass in B minor. In another sense I think of it not so much as my music but a way of listening to Bach's music.