I would recommend a theme that could possibly be more styled for Blink182 - perhaps having your banner include a logo or just be more similar to their logo since it may be copyrighted.
I would consider a 1-3 sentence description for users who are unsure of what goes under what category. At first I didn't realize what could be under "Side Projects" until I saw a thread and realized! I would make sports a subforum of General Discussion, and then add an Introductions area there. "Welcome Center" you could come up with a creative name but still obvious it's meant for introducing yourself.
I like having a section for all sorts of music! "Other Music" - I would try and find a different title, but I understand what you were intending. Also as the area gets more full you could add more categories for other types of music if it does kick off. It would be cool to discuss similar music taste, and I like the idea of sharing playlists and etc. I would suggest a fun thing your community could do is come up with a playlist of the month?
I don't see specific band communities anymore, but definitely a lot of people who still love Blink 182 - just have to really find them and engage them!