Probably more than one. Read the theory sticky, and then look at the notes used in the song.
Someones knowledge of guitar companies spelling determines what amps you can own. Really smart people can own things like Framus because they sound like they might be spelled with a "y" but they aren't.
I`m going to guess G#, correct me if I`m wrong.
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it has 3 keys.
it starts in Am, changes to Bm, then goes to G#m. it then changes back to Am if i'm not wrong.