One of the best-known settings of the Miserere is the 17th century version by Roman School composer Gregorio Allegri. According to a famous story, Wolfgang Amadeus Mozart, aged only fourteen, heard the piece performed once, on April 11, 1770, and after going back to his lodging for the night was able to write out the entire score from memory. He went back a day or two later with his draft to correct some errors. That the final chorus comprises a ten-part harmony underscores the prodigiousness of the young Mozart's musical genius. The piece is also noteworthy in having been transcribed erroneously by William Smith Rockstro as having numerous high Cs in the treble part. This interpolated version is nevertheless extremely popular and widely recorded.