Submissions are to be written for choir, brass quintet and organ, or any combination of these forces and/or instruments.
A maximum time limit of 10 minutes per piece is stipulated, although there is no minimum limit.
Successful applicants will see their work performed in London and around the UK alongside JAM commissions by Paul Mealor and Phillip Cooke. One performance will be professionally recorded.
The submissions deadline is 2 December for assessment by the JAM Panel, which includes Judith Bingham, Nicholas Cleobury, Daniel Cook, Eric Crees, Michael Emery, Timothy Jackson, Robert Jones and Sarah MacDonald.
JAM is advising interested composers go to www.jamconcert.org/info/submit to check on the submission criteria and requirements.
Paul Mealor said: ‘I submitted to JAM when I was a student in 2003. In 2011 JAM commissioned my 'Now Sleeps the Crimson Petal'. That piece went on to change my life. I shall forever be grateful to this terrific organisation and all it does to support and promote the very best British composers!’