One thing that gospel gave rock and roll was a different, more outlandish energy than the blues. Muddy Waters, Robert Johnson et al may have laid a musical foundation for r&r, but not the unbridled - and sometimes unhinged - edge that Little Richard, Jerry Lee Lewis and Elvis did. And we know where those guys picked it up from. Blues is a somber music (thus the name), and even when it plugged in and became party music, it still came with restraints. The states of ecstasy and uninhibitedness the black church generated is the very id of rock n roll. And the colorful preachers who shouted and stomped and sweated across church pulpits are the true forerunners of great performers like Mick Jagger and, of course, Tina Turner. So blues is the musical backbone of r&r, but gospel is what made it fun.