Wolfgang Amadeus Mozart wrote his Adagio in C major, K.356/617a in 1791, intended for the glass harmonica. It is usually performed in the organ. It was written for Marianne Kirchgessner, a blind glass harmonica virtuoso.
According to Willi Apel, "Among various compositions for the glass harmonica, Mozart's Adagio in C major (K. 356) and Adagio and Rondo (K. 617)...both composed in 1791, are the most interesting. They seem to require an instrument equipped with a keyboard mechanism such as that constructed in 1784."
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