Whenever I try to write music, it's difficult for me to expand beyond a single musical idea and develop it into a larger song. Do you ever face this problem and if so, how do you work past it?
just focus on delivering that idea to the audience. it's like sending a cactus to a friend. just get a box that seems appropriate, and get the address right, maybe tie a ribbon on it if that seems nice, and send it. don't worry about adding a second cactus or anything else. unless you think that would somehow enhance the experience