As more trombonists use the alto trombone on recitals, finding music from various historical periods becomes a problem. The works of the baroque and classical periods for alto trombone, such as the Albrechtsberger and Wagenseil concerti, are now performed enough to be considered "warhorses"! Although many contemporary composers, such as Frigyes Hidas and Thom Ritter George, have written excellent new works for the instrument, 20th-century recital music for the alto trombone is still scarce. An alternative is to transcribe works from the brass literature; one of the finest is the Sonata for Alto Horn by Paul Hindemith.