These are the chords to Summer by Calvin Harris.
C Em D
When I met you in the summer
Am Bm C
To my heartbeat sound
C Em D
We fell in love
Am Bm C
As the leaves turned brown
C Em D
We could be together baby
Am Bm C
As long as skies are blue
C Em D
You act so innocent now
Am Bm C
But you lied so soon
When I met you in the summer
Then it just repeats. The rhythm is something like two strums on the C and Em, then
one strum on the D, two strums on the Am and Bm and one on the C. 