The majority of his career was spent at the University of Oxford where he was appointed organist of Magdalen College in 1734, and established his credentials with the degrees of B.Mus in 1735 and D.Mus in 1749.
Hayes also cultivated a self-consciously ‘learned’ polyphonic style (perhaps inspired by his antiquarian interests) which can be seen in his many canons, full-anthems, and the strict fugal movements of his instrumental works.
Although he published virtually none of his instrumental music, his vocal works were extremely popular, and the printed editions were subscribed to by large numbers of amateur and professional musicians.
Substantial works like his ode The Passions, the one-act oratorio The Fall of Jericho, and his Six Cantatas demonstrate that Hayes was one of the finest English composers of the eighteenth century.
In his Remarks he reveals much about his aesthetic outlook: in particular that he valued the music of Handel and Corelli over that of Rameau, Benedetto Marcello and Geminiani.