There’s already a theme emerging in this summer’s deluge of concert announcements – co-headliners. Consolidating multiple popular performers at the top of their game is nothing new, as it’s apparently easier to avoid arguments over who gets to sit atop the bill if you let two different acts share the view from up there. Usually both groups are basically playing to the exact same demographic, but not every team-up pairs two sides of the same coin. The Unheavenly Skye Tour hitting Petco Park on June 26 is co-headlined by prog rockers Coheed & Cambria and somewhat dissimilar hard rock heroes Mastodon. The former is promoting their recent ethereal album The Unheavenly Creatures, while the latter plans to perform their entire thudding 2009 full-length Crack the Skye. The record from Coheed & Cambria (who also occasionally co-create comic books based on their music) furthers their tendency toward 1970s-inspired concept albums, this one set within the Armory Wars universe. The aural equivalent of a Marvel Avengers movie, it debuted at number one on Billboard’s Hard Rock Albums chart and reached the top 20 on the Billboard 200 chart.

Mastodon may be best known for their soundtrack work on Monsters University, the sci-fi comic book western Jonah Hex, and the Academy Award-winning comedy The Big Short, and members have appeared in episodes of HBO’s sword-n-sex drama Game of Thrones. The bill includes Buffalo New York-based hardcore punk rockers Every Time I Die, who are reportedly working on their ninth full-length.