Any middle aged brand manager who, as a teenager, inscribed a Motörhead logo on his homework notebook, knows the value of a great logo to a metal band. Those logos not only allow fans to display their allegiance, they sell merch to people who would never dream of actually listening to anything by Lemmy and his disreputable accomplices. It's amazing what an umlaut can do.
In the death metal sub-genre, for some reason, almost all bands have intricate, almost illegible logos in a style presumably intended to resemble evil, runic inscriptions. This design conformity signals affiliation with the genre, but fails to distinguish the individual band. Party Cannon (see poster above) knows how to challenge genre conventions in order to stand out. At least, I hope there is a death metal band called Party Cannon playing at Death Fest 2, and not just an actual party cannon that will be installed at the event.