This song by Taylor Swift is in C.
Part 5 is an instrumental part, the progression of which is the same as the chorus (Part 3).
These are the “cheat” chords I played…
Part 1: C - F2 - Am7 - F2
Part 2: Am7 - F2 - F2/G
Part 3: C - Am7 - F2 - F2/G
Part 4: Am7 [...]
