The bassoon is part of the standard wind quintet instrumentation, along with the flute, oboe, clarinet, and horn; it is also frequently combined in various ways with other woodwinds. Richard Strauss's "Duet-Concertino" pairs it with the clarinet as "concertante" instruments, with string orchestra in support. An ensemble known as the "reed quintet" also makes use of the bassoon. A reed quintet is made up of an oboe, clarinet, saxophone, bass clarinet, and bassoon. In small ensembles such as this, bassoon's bass function is in greater demand, although in repertoire from the 20th century (when bassoon's top octave and bass-register horn writing became more frequently employed) bassoon writing may call for it to play with the same agility (and often in the same register) as the smaller woodwinds, as seen in cornerstone works like Summer Music.