English composer and organist, Loosemore was the son of John Loosemore, an organ builder who constructed the organ at Exeter Cathedral in Devonshire. Henry Loosemore served as the organist at King's College, Cambridge. In 1640, Loosemore was granted the degree of B.Mus by the University, on the supplication of King's College avowing that 'he had studied the art of musical composition for seven years, together with its practice, and has achieved approval of those skilled in the art.' His mandatory exercise was probably the signed 8-part full anthem, 'Behold now praise the Lord.' His subscription to the three Articles of Religion, as was required of all students obtaining degrees at Cambridge, consists of brief declaration which provides a specimen of his writing and his signature.