Editing Multiphonic (section)

===Brass instruments===
In brass instruments, the most common method of producing multiphonics is by simultaneously playing the instrument and singing into it. When the sung note has a different frequency than the played note (preferably within the [[harmonic series (music)|harmonic series]] of the played note), several new notes that are the [[combination tone|sums/differences of the frequencies]] of the sung note and the played note are produced; leading to the popular term [[trumpet]]/[[trombone]]/[[French horn|horn]] [[growl (wind instruments)|growl]]. This technique is also called "horn chords". The tone sung doesn't necessarily have to be in the played tone's harmonic series, but the effect is more audible if it is. The tone quality of brass multiphonics is influenced strongly by the voice of the player.

Another method is referred to as "lip multiphonics", in which a brass player alters the airflow to blow between [[Harmonic series (music)#Partial|partials]], in the harmonic series of the slide position/valve. The outcome is just as stable as any multiphonic and perfectly structured. When the frequencies add together or subtract from each other (essentially merge), the fundamental is recreated. For example: A 440 and A 220. This would combine to make 660, creating a new fundamental of the second lowest B of the piano.

A third method, known as 'split tones' or [[double buzz]], produces multiphonics when players make their lips vibrate at different speeds against each other. The most common result is a perfect interval, but the range of intervals produced can vary broadly.

{{listen |
  | filename = Trombone-multiphonics.ogg
  | title = Trombone multiphonics
  | description = Demonstration of throat singing on trombone.
|}}