Packed tightly in the club, worshippers to the rock gods anxiously await the melodies they know by heart: The deep drone of the bass, screeching riffs emanating from electric guitar, the pounding on the snare drum, and, finally, the singer screaming the first notes into the microphone. It’s not a scene from New York, Los Angeles or Austin, but rather a nightly tribute to music in sunny South Florida. Most visitors to the region are drawn to the sandy beaches and slathering of sun block, but anyone who knows anything can feel the rumbling of rock ‘n’ roll.