when the song begins just play a bunch of C's (3 on A)
then play a bunch of D's
go back to playing C's
when it gets loud do A's
when he says "i'm here" play B's until "starla dear" then go back to A's
at "serve yourself" play:
E|--5---5---5-----7---7--7-----5---5---5--3-|
then go back to playing A's when it gets loud. At the end when they're jamming it's mostly just climbs from 5 on E to 7 on E to 9 on E to 5 on A to 7 on A to 9 on A to 5 on D, 7 on D, 9 on D and keep repeating that to the end.