Where is this from?

[Count_fuzzball]

Where is the chord progression i-IIIb-II-IV from?

And also, on a completely unrelated note, what chords do you think are being used the piano part of this song:



Thanks.

[jancivil]

Am F G C F Dm G
vi IV V I IV ii V I...

root position.


that'll be five bucks please