Voix céleste

The Voix celeste, (Voix céleste) [Fr.] (heavenly voice) is an organ stop consisting of either one or two ranks of pipes slightly out of tune. The term celeste refers to a rank of pipes detuned slightly so as to produce a beating effect when combined with a normally tuned rank. It is also used to refer to a compound stop of two or more ranks in which all the ranks are detuned relative to each other.