“You’ll be back again,” sang Barry & the Remains, starting their headlining set on Tuesday night at the eighth annual Ponderosa Stomp. It’s a song about a straying girlfriend, but the Remains could have been singing about themselves and many of the four dozen acts — rockabillies, bluesmen, R&B shouters, swamp-rockers, honky-tonkers, psychedelic bands — playing the House of Blues here in the Stomp’s two nights of nine-hour shows. In the mid-1960s Barry & the Remains toured the United States with the Beatles and made an album of crafty, surly garage-rock. Then they broke up, becoming one more rock-history footnote....