Ring des Nibelungen operas. Organ players are also commonly expected to master the harpsichord as well. Doubling elsewhere in the orchestra is rare. With musical theatre pit orchestras, woodwind players are expected to play a large number of woodwind instruments. Jazz, modern, and contemporary music In the swing era of big band music, woodwind players were often expected to play multiple woodwind instruments; saxophonists might be offered gigs where they were also required to play clarinet, for example. The different types of saxophone use similar designs, varying mainly only in size (and therefore pitch), meaning that once a player has learned to play one it is relatively easy for them to translate the skills into another. As a result, many jazz saxophone players have made careers playing several different instruments, such as John Coltrane and Wayne Shorter, both of whom have frequently used both tenor and soprano saxophones. To a lesser extent this is also the case across the range of woodwind instruments: Jazz flute players often play other instruments as well, such as Eric Dolphy and Herbie Mann, both of whom frequently played flute and saxophone; Dolphy also recorded on bass clarinet. In the early years of jazz, when the genre was still linked to the marching band genre, many double-bass players doubled on tuba. From the 1950s onwards and particularly since the development of jazz-rock fusion in the late 1960s, many double-bass players doubled on electric bass, e.g. Stanley Clarke and John Patitucci. Some jazz instrumentalists whose main instrument is a horn or bass also play jazz piano, because piano is an excellent instrument for composing and arranging, and for developing greater harmonic knowledge. Many famous jazz musicians, including James Morrison, Don Burrows, and Brian Landrus, are multi-instrumentalists. Rock and pop music In popular music styles, many musicians and songwriters are multi-instrumentalists. Songwriters often play both piano, a key instrument for arranging and composing, and popular pop or rock instruments such as guitar. A backing band member who doubles will be instructed by the bandleader when to switch instruments (e.g., from bass to Hammond organ). When playing live, most multi-instrumentalists will concentrate on their main instrument and/or vocals, and hire or recruit backing musicians (or use a sequencer) to play the other instruments, thus benefiting from economies of scope. Examples Some musicians have pushed the limits of human musical skill on different instruments. British entertainer Roy Castle once