Guitar gets theoretical

Last night guitar class got all theoretical and we did keys and chords. This was quite revelatory to me, as I have never learnt music this way. I put my guitar down, picked up my pen and took pages of notes. Our teacher is actually trained in classical piano, so is quite thorough in the technical details, which suits the likes of me, who prefers to feel that I understand how things work properly.

Then we were given a song by Powderfinger, apparently the patrons of Cmajor key, as an example: My Happiness.