The remnants of pop-emo's heyday (the early aughts, let's say) are mainly carcasses, reunion tours and/or disappointing new albums that make fans wish their old favorite group would stop tarnishing its legacy. Thrice is an exception. The Orange County, Calif. quartet has evolved into an ambitious rock band that's more prog than punk. But there's still muscle to these songs, and even small, fleeting reminders of the group's hardcore roots. For proof, check out the band's set at Recher Theatre Saturday night, a more adrenaline-based show than the Arctic Monkeys/Smith Westerns gig at Rams Head Live that same night. La Dispute, O'Brother and Moving Mountains will also perform.