Now that Ty Segall and John Dwyer have fled to Los Angeles, everyone’s ready to bury San Francisco’s garage-rock scene and jump on the next hyped-up trend. And judging by the sounds emanating from the young people’s amplifiers, it’s all about slack rock. Not quite punk enough to be grunge, and not poppy enough to be garage, the style nonetheless requires heaps of distortion, ear-bleeding sound levels, and a couldn’t-care-less attitude (not to mention a healthy obsession with the Nineties). Drenge — which will stop by Bottom of the Hill (1233 17th St., San Francisco) this week — brings a British touch to the sound. Brothers Eion and Rory Loveless crank out raw, bluesy, heavy riff rock and bashing drumbeats that fill the room in the Black Keys (rather than White Stripes) tradition. The young duo has already played huge UK festivals such as Glastonbury and the Reading and Leeds festivals, and even opened for The Rolling Stones. Its sound may not be anything new, but as is often the case, it’s more about the energy conveyed. On that note, these guys nail it. Local acts Happy Diving and The Started-Its will open the all-ages show.