ArtSong is a versatile MIDI-based algorithmic music composition system for Windows® computers. ArtSong offers an alternative to 'either/or' by uniquely combining the music-structuring capabilities of pattern-looping programs with the open-creativity of generative programs. Generate larger coordinated musical structures with greater creative control over the balance of repetition vs novelty. ArtSong offers multiple ways of composing ranging from simply adding musical segments and assigning presets to customizing individual value-ranges and assigning driving-functions to the 100 or more variables controlling the composition process. Variables are provided for form, phrasing, melody,harmony, rhythm, and texture. Driving functions vary from user-specified value sequences to random value sequences and include various pattern generators, fourier functions, IFS and Quadratic function attractors, ramp functions, Text to MIDI, and Image to MIDI.