Echo Sonata for Two Unfriendly Groups Of InstrumentsEcho Sonata for Two Unfriendly Groups Of Instruments, S. 999999,
Flute, Oboe, Bassoon, French Horn, Trumpet in Bb, Trombone, (December 13, 1966), (3 min.).
Published by Theodore Presser Company (1992), 114-40580.
Recording available on the albums P.D.Q. Bach On the Air (interrupted version), The Dreaded P.D.Q. Bach Collection (interrupted version again), and Portrait of P.D.Q. Bach (complete).
Premiere: December 26, 1966 at Carnegie Hall in New York City.
Selected performances: December 26, 27, 28, and 30, 1987 at Carnegie Hall in New York City.