Ozzy Osbourne did indeed bark at the moon on Monday when he performed at the Moonstock Festival in Carterville, Illinois during the total eclipse.
His set started to coincide with the eclipse, which meant when he began, it was light out. But soon the moon passed in front, casting darkness over the show. And by the time Ozzy finished the song, the sun was shining brightly again. Pretty cool to see it get dark during the song.