Software-generated conversion from a MIDI from ingeb.org, notably starting with the "verse" part "When I'm happy" etc.:

X:1
T:showmeth
I:linebreak $
M:C
L:1/8
Q:1/4=145
K:G
B2B2B2B2| c2c2c2c2| B2B2A2G2| A8 | B2B2B2B2| c2c2c2c2| B2B2A2A2| G8 | F2F2G2G2| A2F2A4| % 10
B2B2^c2c2| A8 | F2F2G2G2| A2F2A4| B2B2^c2A2| d8 |:B2B^A BAB2| G6 B2| c2cB cBcc | % 19
B6 G2| B^ABA BABA | B2B2G2BG | B2A2AB3| A6 B2| B2B2B2B2| G6 B2| c2c2c2c2| B6 GA | % 28
B2B2B2B2| B^AB2G4| =A2AG BGA2| G8:|]

A scan of the "self-published" original sheet music would be interesting. Rhythm? Accompaniment?