A musical learning algorithm

Gradus is a computer program designed to produce compositional pieces. Initially, Gradus analyzes a set of model two-voice, one-against-one, first-species counterpoints in order to produce a series of compositional goals. Following this, Gradus attempts to compose goal-correct counterpoints similar to the models using a given fixed voice called a cantus firmus. The program uses its accumulated experiences to increase the chances it will succeed. Ultimately, the program learns to compose first-species counterpoint quickly, accurately, and without any need for backtracking.