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Split tone Split tones are a multiphonic effect on the trumpet or other brass instruments. During normal play, the upper and lower lips will vibrate together at the same speed. If, however, the lips are set to vibrate at different speeds two pitches may be perceived. When not done intentionally, split tones are referred to pejoratively as "double buzzing". ==Notation== In ''Keren'' by Iannis Xenakis, split tones are notated with two pitches sharing a stem. The lower note is in parentheses.〔Xenakis, Iannis. ''Keren''. Paris: Salabert, 1986.〕 Though the notation is not explained in the score, in another work from 1986, ''Jalons'', Xenakis explains that the two notes should be produced with the lips and not with singing. Throughout ''Jalons'', Xenakis uses split tones extensively in the woodwinds and trombone.〔Collings, Bruce. ''(musikFabrikblog )''. Accessed: November 7, 2011.〕
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