MuseNet by OpenAI used to allow you to do this - but OpenAI took it down over a year ago. https://openai.com/index/musenet https://openai.com/index/musenet Al

MuseNet by OpenAI used to allow you to do this - but OpenAI took it down over a year ago. https://openai.com/index/musenet https://openai.com/index/musenet Also, Synfire is a somewhat difficult to grok DAW designed around algorithmically generating midi motif as building blocks for longer pieces. https://www.youtube.com/watch?v=OrtJjEiWBtI https://www.youtube.com/watch?v=OrtJjEiWBtI It's not particularly well-known but it's been around for many years.