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Stimmung, for 6 vocalists & 6 microphones, is a piece by Karlheinz Stockhausen written in 1968 and commissioned by the City of Cologne for the Collegium Vocale. Its average length is seventy-four minutes.
Influenced by LaMonte Young and long periods of practicing humming, the piece is in just intonation, its title meaning tuning or in tune in German (Die Stimme = voice). Six singers amplified by six microphones tune to a low Bb drone inaudible for the audience and expand upwards through overtone singing, with harmonics 2, 3, 4, 5, 7, and 9 also being used as fundamentals for overtone singing. It is in 51 sections and is the first European influenced piece to be based entirely on vocal harmonics (Rose & Ireland, 1986).
According to the 1986 Hyperion Singcircle liner notes:
The order of the sections and the "magic names" used are decided by the performing group, with Singcircle directed by Singcircle directed by Gregory Rose, recorded 1983. Hyperion CDA66115. Liner notes by Stockhausen, Gregory Rose and Helen Ireland.