This is an old 50s/60s song, I thing it was an instrumental, kind of a rock feel to it.
I may not have the exact chords right, but it's generally D D E, where the D chords are quarter notes, the E is a whole note, or maybe a half note tied to a whole note for the next measure.
That gets repeated a couple/few times, then it changes the E to an A
And there is a pentatonic walkdown using the open E - in other words, starting on the high E string 2 notes on each string: G open E, D open B, A open G, E open D, B open A, G (held with vibrato) open low E.
It's a well known song and I can't remember the name of it.