He also wrote duos, trios and quartets. Hindemith wrote seven string quartets and two string trios, among other chamber works. He also performs frequently with trios and quartets and larger orchestral units. Some power trios feature two lead vocalists. Beethoven made his formal debut as a composer with three Piano Trios, Op. Bobby Farrell also toured with varying trios of female performers. In jazz, there are several types of trios. The first oboe trios were composed by Johan Went for the Teimer brothers. He was editor of the complete Beethoven piano trios for C.F. Peters Edition. Males rarely travel in pairs or trios. Sung by male trios, it is strongly harmonic and occasionally dissonant. He competed with his brothers in multiple trios matches. It also contains an edition of the two earlier Trios for concert performance. From 1661 on, the trios and dances he wrote for the court were promptly published. Three successive presidencies are known as "presidency trios".