Long Ago

Timing wise I feel it as a 6/8 kinda ballad-y beat @ about 92bpm.

Chord wise will do the best I can here...

Main riff
Open G to D that slides to E and back alternating the end each time with a lick or to a D chord with 3rd in the bass (most often)

Section 2 is basically arppeggiating a C9 and a G in open position and back to the main.

Section 3 is Am (open position and adding the D on 2nd string every other), C (same as above open pos and adding the D note), G (3rd position and every other to a sort of G7) and finally to D again.