he plays it at about 15 notes per second... very fast, but there are quite a few well known shredders who play at 16 ish and probably a few unknowns who play even faster.
as for the guitarist dude playing flight of the bumblebee ... that record is whack lol. the problem is that for the guinness committee to judge, the recording needs to be slowed down. but with that much overdrive i very much doubt anything can be made out, it's just a mess. which is probably why they've suspended the record holding while they look into how it's judged.
but whatevs. the violinist has glitter in his hair.