sharon back i have listened to recordingd ot the maori way of playing and the was I learnt as an irish tradition. Seems to be a lot more doubling of note with N Z than IRL. I play if in 4/4 time with the first 3 note on the up beat. Its all in crotchet counting here. Hope you can follow it . Remember !st three note upbeat after that will put in numbers for lenght of beats. Have also put in the harmony below it. As i play it.

Verse
D B A | G2 B3   D G F* E5
A A G F*2   A3   D E F* G5
Chorus
G A B C2 C3   E G C B5
GG A B A2 A3   D E F* G5    (*=SHARP)

Harmony

D D' C | B2 D'3   B B D' C5
   C C C D'2 D'3   D'C D' B5
   B C D' C2 C3   C C C B2 G2 B
   B BCD' C2 C3   D' C D'
   B2 D' C B                         ('=HIGH NOTE)

Hope you can follow this. Ps not always played at weddingd , I have never heard it played at a wedding but have heard it played as an instrumental for the offeratior at any mass service. Best of luck. Sharon