Another straight eighth groove that was popular in the '50s (and '60s) is the flattened-out double shuffle.

One of the best recorded examples of this groove can be heard in Charles Connor's absolutely monstrous introduction to the 1957 Little Richard Classic "Keep a Knockin". The lethal pummeling that Connor administered to his drums must have left a lasting impact on all future rock 'n' rollers, because 15 years later John Bonham practically reproduced that intro note for note in his opening to Led Zeppelin's "Rock 'n' Roll".