CALLCOTT, JOHN WALL, a celebrated composer of music, was born at Kensington in 1776. When nineteen years of age he was admitted bachelor of music at Oxford, and having studied under Haydn for about a year, he obtained the degree of doctor in 1800. Besides his Musical Grammar, he composed a great number of original works, and is especially celebrated for his glees. They were collected and published after his death, which took place in 1821.