Beware, children: The Melvins, lordly gods of bone-crunching sludge-grunge, are coming to melt your eardrums. Longtime members Buzz Osborne (exquisite thrashing, psychotic vocals) and Dale Crover (swamp-heavy drum thuds) have joined with Big Business bandmates Jared Warren (bass) and Coady Willis (drums) to breed a new, ultra-heavy sound. (That’s right, the Melvins now have two drummers.) Touring on the bombastic new album, (A) Senile Animal, the band has designed a way to reign all night. Big Business will be the opening band, but before the music there is a screening of A Purge of Dissidents, a short animated film with a soundtrack by the Melvins and friends, including Jon Spencer and Jesus Lizard’s David Yow.