I’m much more impressed by this guy who memorized most of Beowulf, recites it to a harp (lyre?) that he plays and acts it out - IN OLD ENGLISH!
I took a course in Old English at Harvard. I also knew Jess Bessinger at NYU. He also memorized Beowulf, and used to recite it while playing a harp which was his best guess as to what the original bards used to play. He made a recording of it, I believe.
I memorized the first lines of Beowulf, the Battle of Brunanburgh, and a few other poems. But not the whole poems.