Well I'm going to be really pedantic here.
A "celesta" is the spelling for the percussion instrument consisting of metal bars and hammers, but there is another type of musical-sound referred to as "celeste"....usually "Voix Celeste," or "heavenly voice."
This you will find on an organ, and especially a French romantic organ built in the 19th century by Aristide Cavaille-Coll ,(Paris). They are also to be found on the majority of British and American pipe-organs
The "Voix Celeste" (sometimes just "Celeste") is what is termed an undulating register (a rank of pipes), in that it is tuned slightly sharp of true pitch. When combined with a rank of pipes of similar character, speaking at true pitch, (a soft organ imitation of string-tone), there is a slight wobble or out-of-tune "beat" which is very beautiful and atmospheric.
So this is the REAL answer to the question as asked, even though the questioner was probably thinking of the "Celesta."


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