Badass Vector Works by is a French graffiti crew now based in Montreal, Qc of Canada. Since have worked and have been specializing in character illustration, branding, toy design, and touring the world one wall after another.
Most of these do a very good job of letting the audience know it's about music and about the content. The placement of the types is probably my favorite part, though. Could experiment with illustrated designs like this or with more colour.