[Hatredcopter]

The university degree is sorta the key component, here. If you don't have it, you can't work in Japan at all. I also don't think being a musician would get you a working visa in the first place. You can get an "entertainment visa" as a musician, but those are typically only given out to people who already have a big reputation in the music industry (Marty Friedman, a guitarist who lives and does music in Japan, comes to mind).