This song is much simpler than you're making it.
Look at the chord structure and not the individual notes and you'll realize it's a constant pattern through the whole song.
Using the numbers the chords are: (hope you know the number system)
Woke up - 1
Beating - 4
Time - 1
Treehouse - 4
few - 3
away - 6
robin - 2
song - 5
I don't know - 1
pretty soon - 4
way - 6
say - 4
Grea - 3
eat - 5
ful - 6
thank you -2
another - 5
day - 1
praise his name - 4
praise his name - 1
praise his name - 3 to 6
robin - 4
say - 3
thank you - 2
do it - 5
too - 1
same chord structure repeats the entire song. As for the bass line, once you get that 5-6-1-1-5-1 little roll, that is a constant depending on which chord you are on.
I made it as simple as I could.