Johnny Burnette & The Rock 'n' Roll Trio
Listening to it now, it sounds primitive. The instrumentation is basic, just a couple of guitars, a double bass and a couple of drums. The singing, in particular, is untrained, raucous and direct. But it has an energy and urgency that is missing from the cool, restrained and (above all) professional music coming from the established artists of the time.
Maybe the iconic figure of rock 'n' roll is Elvis Presley (who also released his debut in 1956) but this album is clearly one of the formative roots of rockabilly (they even have a song called "Rock Billy Boogie"). I found it of more than just historical interest; it's very immediate and some of the guitar sounds are really grungy. Good stuff.