Fifty years ago, during the short interlude between Elvis and the Beatles, there was a brief sighting of that rarest of species: the “instrumental hit record.” Riding on the coattails of surf music came a spate of non-vocal bestsellers in styles ranging from cool R&B (Booker T. & the MGs’ “Green Onions”) to funky piano jazz (Ramsey Lewis’ “The In Crowd”) to shuffle blues (Freddie King’s “Hide Away”).