Originally Posted by: NickFerra

I'm used to playing songs in standard tunings. I'm trying out for a band and they play:

Blvd of broken dreams by Green day In the key of E

And She Fn hates me by Puddle of mud in G instead of F

Can anyone help me out what to do?

I don't know how to change keys or what to play

Can you clarify, are you asking how to transpose key, or how to play a song in standard tuning, if alternate tuning is originally used? Those are not the same thing.