- Referring to a noise that is heard but whose source is hidden.
- Referring to Pythagorean disciples who for years listened to his lectures from behind a curtain, unable to see him.
- (context, music) Referring to music that can not be performed live on stage, e.g. some types of computer music.
- Jéríme Peignot, 1955
- Franíois Bayle, 1974
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