Mutations from Bach Samuel Barber Born March 9, 1910, West Chester, Pennsylvania Died January 23, 1981, New York, New York Instrumentation: Orchestral Brass Section and Timpani Duration: 6 minutes Composed: 1968 Samuel Barber, Mutations from Bach Royal Scottish National Orchestra, Marin Alsop, conductor Mutations from Bach, compiled and arranged for brass ensemble and timpani by Samuel Barber, is made up of a short sequence of transformations of the plain-song, Christe, du La