New York Times has an article about the crossover between comics and music (registration required).
This article doesn’t talk about this, but I do see a pretty big connection between the indie comics scene and the indie music scene. It does seem like most people in both are doing it for the love and because they have ideas to express. If money and fame follows, that’s great, but it’s not about that.
Of course, shoving Avril Lavigne into an English-language manga is an entirely different matter.