Prior to the invention of tension rods, drum skins were attached and tuned by rope systems—as on the Djembe—or pegs and ropes such as on Ewe Drums. These methods are rarely used today, though sometimes appear on regimental marching band snare drums. The head of a talking drum, for example, can be temporarily tightened by squeezing the ropes that connect the top and bottom heads. Similarly, the tabla is tuned by hammering a disc held in place around the drum by ropes stretching from the top to bottom head. Orchestral timpani can be quickly tuned to precise pitches by using a foot pedal.
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Composers using electric bass include Christian Wolff (Electric Spring 1, 1966; Electric Spring 2, 1966/70; Electric Spring 3, 1967; and Untitled, 1996); Francis Thorne (Liebesrock 1968–69); Krzysztof Penderecki (Cello Concerto no. 1, 1966/67, rev. 1971/72; Capriccio for Violin and Orchestra, 1967); The Devils of Loudun, 1969; Kosmogonia, 1970; and Partita, 1971); Louis Andriessen (Spektakel, 1970; De Staat, 1972–1976; Hoketus, 1976; De Tijd, 1980–81; and De Materie, 1984–1988); Pelle Gudmundsen-Holmgreen (Symfoni på Rygmarven, 1966; Rerepriser, 1967; and Piece by Piece, 1968); and Irwin Bazelon (Churchill Downs, 1970).
A drum kit — also called a drum set, trap set (a term using a contraction of the word, “contraption”), or simply drums — is a collection of drums and other percussion instruments, typically cymbals, which are set up on stands to be played by a single player, with drumsticks held in both hands, and the feet operating pedals that control the hi-hat cymbal and the beater for the bass drum. A drum kit consists of a mix of drums (categorized classically as membranophones, Hornbostel-Sachs high-level classification 2) and idiophones – most significantly cymbals, but can also include the woodblock and cowbell (classified as Hornbostel-Sachs high-level classification 1). In the 2000s, some kits also include electronic instruments (Hornbostel-Sachs classification 53). Also, both hybrid (mixing acoustic instruments and electronic drums) and entirely electronic kits are used.