My main problem with this song being played live by tributes is the McCartney singing, he never sings on the record or, on the bbc recordings.. There is some visual evidence that during their short fall 1964 UK tour, McCartney sang along with lennon, but there is no audio evidence of this, so a tribute adding in McCartney just sounds alien to me
Hohner, key of c, breathing in to start off the riff. They sometimes use the key of b if they've got a lot of performances in a week, so it's not super high every night.