If there is one thing that Billie Joe has talked about with recent Green Day tours, it is that he has developed the ability to keep learning. He touts the ability to think about music as a business and not as an art-form, as much as he did when he first started in on music.
He has recently opened a guitar shop in Oakland, CA. He speaks about how he not only wanted to give back to the community, and provide the instruments that will create the next generation of musicians, but he also wanted to give other entrepreneurial ventures a try! We see this all the time with famous athletes and whatnot, and now Billie seems to be having a go at it. Good for him!