As presented by the Axis of Awesome, numerous billboard hits have the same basic 4-chord pattern they follow.
They play it as E, B, C#m, and A; but pattern can be transcribed into any key, such as:
G, D, Em, C
D, A, Bm, G
C, G, Am, F
A, E, F#m, D

16 hits by various top artists including Green Day, Maroon 5, MGMT, etc.

16 tracks