Five extreme bands play the Church tonight; don’t miss the first two. It begins with Xanax, a punk supergroup of sorts featuring members of +HIRS+, Des Ark, Pink Coffins, Saetia and Off Minor. “With Paws” and “Milk Youth,” the two demos Xanax has up on SoundCloud, sound like what might happen if a vengeful claustrophobic anarchist stoned on bath salts was trapped in an elevator with Mitt Romney and the ghost of General Franco: screaming/growling-/puking vocal exchanges over stabbing riffs and bellicose beats. Then comes Heavy Medical, a West Philly trio with two drummers plus a bassist/-vocalist. Beneath the gunk, howls and perilously thrashing arms, there’s a groove. But this groove is suicidal such that it wants to die inside the noise and chaos. And the latter are so beguiling that you can’t really blame the groove for wanting to die in them. 

Sun., Jan. 6, 6:30 p.m., $10, with Reign Supreme, Ghostlimb and Plague Dogs, First Unitarian Church, 2125 Chestnut St., 877-435-9849, r5productions.com.