2 chord Major , challenge to reconise


as a student, to reconsign Chords, it’s a challenge!

so I came on a video , to try to give me chrods melody.

what I found was this

I Walk The Line Johnny Cash-TRAVIS PICKING STYLE

to analyse the chords he 's using, I found the 2 chord in it.
to recognise by ear,…not yet :wink:

do you recolonise the 2chord Major in the melody?
let me now!



Closed as duplicate of Reconise chords , 2 chord Major