JCS performs a wide variety of music, and in addition to the standard choral repertoire performs works from Early Music (Tallis 40 part motet) to Opera (Carmen), Jazz and Spirituals.

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In a normal year, JAGS Choral Society would perform in Southwark Cathedral in December, St John's, Smith Square or Cadogan Hall in the Spring and then cap the year with a choral-orchestral concert often supported by James Allen Community Orchestra (JACO) to perform a major choral work. The Summer Concert takes place in the Vaughan Williams Auditorium (VWA) at JAGS and is usually held in mid-June.

At Christmas, JCS and JACO usually host a Community Carols event at JAGS to raise money for charity.

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In addition to the regular concerts performed each year, JAGS Choral Society performs from time to time in concert with other choirs in the Royal Festival Hall, and other venues, and in concert tours in the UK and abroad.