CLCE
CLCE (Common Lisp Composition Environment) is a complete environment for Musical composition based on the Common Lisp language and on the MidiShare operating system. CLCE is in the line of our works on compositional languages. It allows the treatment of compositional problems and writing of interactive works in a homogeneous way, with a set of tools which can be used both in real time and delayed time.

More information here.   [dead link - April 2014]