I am just going to list the chords, in order. Here goes:
Cmaj7 Cmaj7/G Fmaj7
Cmaj7 Cmaj7/G Fmaj7 Dm Dm7
G Dm Dm7 G (repeats)
Then at the “ooohhh” part it goes ….
C C/Bb Ab Db(9) Db
Ooooh oohh……………….
[ Tab from: https://www.guitartabs.cc/tabs/e/enya/drifting_crd.html ]
Ab Db(9) Db
oohh ………………
Gb Eb Ab Db(9) Db
Oohh…………….. oohh……………….
Ab G C
Oohh……………………………
Cmaj7: x32000 or x35453
Cmaj7/G: 332000 or 335453
Fmaj7: x03210 or x8 10 9 10 8
Dm: xx0231 or x57765
Dm7: xx0211 or x57565
C/Bb: x12010
Db(9): x43x44
Db: x46664 or x43121 or xx3121
Ab: 466544
Eb: x68876 or xx5343 or xx1343