"Roll over" simply means to give way to pressure.

https://dictionary.cambridge.org/dictionary/english/roll-over

In this context Chuck Berry is telling classical composers (Beethoven, Tchaikovsky, etc) to "get of the way, rock and roll is here".

There could be a "roll over in his grave" interpretation (the normal terminology is "turn in his grave" though, but without a reference to Berry's intent, the standard definition seems to be the simplest explanation.

"Roll over" simply means to give way to pressure.

https://dictionary.cambridge.org/dictionary/english/roll-over

In this context Chuck Berry is telling classical composers (Beethoven, Tchaikovsky, etc) to "give way, rock and roll is here".

There could be a "roll over in his grave" interpretation (the normal terminology is "turn in his grave" though), but without a reference to Berry's intent, the standard definition seems to be the simplest explanation.