Detroit Metal City, K-On! Recommendations
Both are filled with comedy, although of vastly differing genres, but the biggest similarity between the two remains the big draw of in show music, and this is where both shows sign. K-ON has sort of half over detailed concert/music video, while DMC has the crowd's reactions to unusual stage events, which remains the funniest thing about DMC. Fans of these probably won't overlap, with K-ON picked up by S-O-L fans and DMC by fans of Cromatarie or metalheads, but while DMC is pure untampered awesome, K-ON's awesome-ness doesn't really show until you think about how much you are enjoying a story about 4 girls
About people in a band. Really good characters. More for the experienced anime viewer.
Although different by music genre (metal/rock), both comedies are about music band and relationship between band members and people around.