I think “Mind=Blown” is overused these days. But every so often I see where that response absolutely applies. This musician's reaction after listening to Roundabout for the first time leaves me with no doubt that his mind was blown away. He can't think straight or complete some of his sentences.
The song ends and his reaction starts at 9:45 into the video.
Jump to the end of the song and his reaction or watch (and listen!) to the whole thing:
(I just realized that Roundabout was recorded FIFTY years ago!)