Rock & Roll, for me, is a synonym for music with blues, gospel, soul and country roots (however far away), though other influences such as folk and classical may come in, and any attempts to delineate "rock" from "pop" pretty much fail. Rock is generally more guitar oriented, but who would say that Keith Emerson stabbing his B3 with a knife wasn't rock? And we all know that the lead guitar solos on ELP records were kinda mixed into the background. And if you listen to a Chic song and can't hear how Nile Rodger's guitar playing is driving along the song, go get a hearing aid.
Whether Chic is rock or not is comprehensively answered at 2.53 here:
And Bernard Edwards was such a darn cool player, no two ways about it.
I listen to Rory Gallagher followed by Ultravox followed by Taylor Swift followed by Bobby Womack
followed by The Darkness followed by Saga followed by the new Dylan in the car and, CD for CD, never does the thought cross my mind once that it might not be "rock" I'm listening to. With my volume, anything is rock.
And please cast your votes what this is: R'n'B, pop or rock or all three?