Source : Free On-Line Dictionary of Computing

Pla
     
         A high-level music programming language,
        written in {SAIL}.  Pla includes {concurrency} based on
        {message passing}.
     
        ["Pla: A Composer's Idea of a Language", B. Schottstaedt,
        Computer Music J 7(1):11-20, Winter 1983].
     
        (1999-06-04)