English composer. He was a chorister at Eton College and studied with the organist John Walter; from 1693 he studied with Purcell. His first appointment was as organist at New College, Oxford (1694-1702). In 1701 he became a Gentleman Extraordinary of the Chapel Royal, and the following year he was appointed organist of St. Bride's, Fleet Street. in London. Weldon later acquired the positions of an organist of the Chapel Royal and organist of St. Bride's Church, Fleet Street (1708), organist of St. Martin-in-the-Fields (1714), and second composer to the Chapel Royal (1715). His compositions include several stage works (The Judgement of Paris,1701; The Tempest,ca. 1712), anthems, services, odes, songs, and several instrumental works.