In Music City, bands are born every day, and bands die every day. Sometimes they fall apart in stunning meltdowns, and sometimes they dissolve in utter obscurity. There's nothing especially noteworthy about the death of a band in Nashville. No, it's not a big deal or a special occasion. But you know what is a special occasion? When one of those soon-to-be-deceased bands is actually worth a damn — when they make singular, stirring, noteworthy music. Nashville four-piece Heartbeater has been making a grunge- and college-rock-inspired sort of rock ’n’ roll for a few years now. It’s upbeat and it’s insistent, heavy without sacrificing melody. Last year’s Slow Waves was full of riff-centric surf-grunge that had local fans of Pixies and Dino Jr. — plus, you know, virtually everything that came out on Matador Records in the ’90s — salivating. Now, as frontman Greg Mabry plans to move to the West Coast — why do frontmen always do that?! — Heartbeater has booked a couple of farewell shows, culminating with tonight’s set at The 5 Spot. It’s a good bill, too, with fellow locals Bows and Arrows and Action! joining the party. There’s also talk of one final, semi-posthumous Heartbeater EP being released. Spoiler alert: It’s gonna sound heavy.