I'm with robey and dwtf. I pretty much always play it in A. I think the older versions are in G,
I think they also started to play it at some point, late eighties I believe, where they would delay and cover another measure in A before going to the next line of the song.
Did not like that at all.
I play A Ionian, sometimes A Pentatonic.
D Lydian though sometimes D Pentatonic.
F# Aeolian sometimes F#m Pentatonic
C# Phrygian sometimes C#m Pentatonic
I've been trying to cite appropriate modal references lately. While I guess I've kinda been doing it all along, I really didn't know what I was doing.
For all I know I'm citing the wrong key. The notes for A Ionian are what I play. Different Pentatonic sub scales as well.
Feel free to straighten my shit out if I'm talkin out my butthole.