I'm surprised the tune hasn't been posted here before, but I can't see it on a quick look, so here's a rough version from my singing.

Mick

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X:1
T:It Was On One April Morning
S:Mick Pearce
L:1/4
Q:1/4=120
M:C
K:D
A,|D> D E C|(3:2:2(D2 E) F B|A> F (F/E/) D|F E2
w:Twas on one Ap-ril morn_ing just as the sun_ was ris-ing
A,|D> D E C|(3:2:2(D2 E) F D|G> G (G/A/) B|A3
w:Twas on one Ap-ril morn_ing I heard the small_ birds sing
F/G/|A> A B A|(G/F/) D2 (D/F/)|A> F (F/E/) D|F E2
w:They were sing-ing love-ly Nan_cy, O_ love it is_ a fan-cy
(D/F/)|A2 B> A|(G/F/) D2 F|A> D E C|D3||
w:And_ sweet were the notes_ that I heard the small birds sing