Tom: Dm

Dm Am Dm Am
Dm Am Dm F

Gm Gm F Am Dm 
x2

The bridge part (where it becomes higher) goes something like:
[F] C C F F
[F][Am] C C F F

Then it goes back to the previous pattern (verse), except instead of 'F major' you 
play a 'C major' in the final bit:

Gm Gm C Am Dm