Hum

Wikipedia explains the term Hum:

The action of humming is produced simply by producing a wordless tone, such as in scat singing or vocables (wordless forms of singing), but with the mouth completely closed so that the sound emerges from the nose. This necessarily keeps the volume at a low level, so humming is often not useful in musical productions, but is nonetheless sometimes used.

Upon which they mention Frank Zappa.

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