I've tried to compose a song six times with my musical sim (violin) and it's always failed because he get's hungry before finishing. Today I found in his inventory he has sheet music that he can use to resume composing... days of disappointment at trying to get this working evaporated :smile: .
ETA: Only seems to work when the violin is in the environment. I was about to post about it not working at all but randomly thought to try it with the violin placed in the environment and it worked. Also it looks like having the violin in inventory interrupts the end of the compose cycle and you're not asked to name the song... definitely a bug. I finished 4 songs in a few seconds because they were done, but wouldn't finish until I had a violin in the environment rather then inventory.