That first girl is probably technically superior, but without detracting from that I could help think while watching it that she was doing the audio equivalent of a video game, the second girl sounded like she was playing music, so you didn't really mind her not being Keef (ETA - she is ten years older thobut)
I'm going to go and listen to some more Zepparella now.
(ETA followed by Ten Years After, methinks - who hasn't got much work this afternoon then ?
)
(EATA Probably wasn't fair to put Alvin Lee alongside)