1911 Encyclopædia Britannica, Volume 6… (1911)
“ MUZIO CLEMENTI (c. 1751–1832) , Italian pianist and composer, was born at Rome between 1750 and 1752. His father, a jeweller, encouraged his son’s early musical talent. Buroni and Cordicelli were his first masters, and at the age of nine Clementi’s theoretical and practical studies had advanced to such a degree that he was able to win the position of organist at a church. He continued his studies under Santarelli and Carpani, and at the age of fourteen wrote a mass which was performed in public. ”
