MMM : Multi-Track Music Machine
Jeff Ens, Philippe Pasquier
Simon Fraser University
We propose MMM, a generative system based on the Transformer architecture that is capable of generating multi-track music. In contrast to previous work, which represents musical material as a single time-ordered sequence, where the musical events corresponding to different tracks are interleaved, we create a time-ordered sequence of musical events for each track and concatenate several tracks into a single sequence. This takes advantage of the attention-mechanism, which can adeptly handle long-term dependencies. We explore how various representations can offer the user a high degree of control at generation time, providing an interactive demo that accommodates track-level and bar-level inpainting, and offers control over track instrumentation and note density.

To see the system in action, watch the video, listen to some of the examples, or try the demo. For more details, you can read the paper.
This video demonstrates how MMM can be applied to longer pieces.
This video demonstrates the original version of MMM.