Create a prompt to generate a melody or chord progression in the MIDI format. You may include the number of bars, the progression (if you want a melody to fit it), a style/genre and so on. You can include any context you see fit to generate a more personalized melody or progression. Subsequent prompts will use the previous context to generate something connected to the previous prompt. You can for example, ask for a piano chord progression, then a bass line that fits the progression, then a melody that fits the progression and the bass line.