In about 2003 I tried something very similar, except I time boxed a song. I had to spend an hour and a half and each song could only take 15 minutes. That ended up being incredibly fruitful.
You don't have time to think, you just go stream of consciousness through whatever comes to mind. Drums are weird? Too bad, there is no time, go with it. Throw in a 8 bar synth or piano loop. It's not good? Well, there isn't much time so on to the next thing.
This ended doing a few things for me. For one, there was no second guessing anything. You just made what you made. For two there was no pressure to do a good job. You can't do a good job you are just rushing through. That lets things just flow. Thirdly it allowed me to try a ton of things that I wouldn't normally try. There was no wrong answer. All three are kinda related.
I made some of my favorite songs that way and they are songs I still love. I later applied this to writing a technical book. I forced myself to write for 5 minutes a day, everyday. Sometimes it'd be 2 hours and other times it'd be 5 minutes but I got the book done and it became pretty popular. (also had a monetary penalty if I couldn't write on any particular day).
I really love this way of working. Just time box and go.