The men of the choir are either undergraduates at the college or, occasionally, lay clerks (who have generally just graduated from St John's or another Cambridge college). As well as singing with the boys, they sing one service a week on their own and all services when the boys are on their half term holiday. As the a cappella vocal ensemble, the Gentlemen of St John's, they also sing lighter music, and are in frequent demand for concerts, May Balls, and many other engagements; they have also recorded many CDs ranging from close-harmony to renaissance music and tour regularly around the world.