K-On! Meets Electric Light Orchestra
As several people pointed out in the comments, the synchronization here is amazingly superb — especially the movements of Yui's mouth to the refrain, "Whamalamabamalama, rock'n'roll is king," but it starts as early as the first drumbeats matched to when Ritsu brings the sticks down.
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"The Lady of the Lake, her arm clad in the purest shimmering samite, held aloft Excalibur from the bosom of the water, signifying by divine providence that this was some killer weed."
"The Lady of the Lake, her arm clad in the purest shimmering samite, held aloft Excalibur from the bosom of the water, signifying by divine providence that this was some killer weed."