Publisher Desc.  Tuning reference (A=443Hz). PLAY IT 'play- along' CDs offer the accompaniment in at least 3 tempi--one at full tempo, others at slower practice tempi--providing every musician, regardless of ability, an exciting and dependable chamber music experience. Accompaniments are realized with either a concert grand piano, harpsichord, continuo ensemble or virtual orchestra. PLEASE NOTE: Sheet music is not included. Matching edition (not available through C.F. Peters Corp.): Bosworth Music BOE 3898.