_ / _ A _ _ A / _ O / _ A _ _ / T O / _ _ / _ _ TT_ E / _ _ A_ _ / _ _ A_ _ / _ _ / _ EA _ A_ E _ _ A , / _ A _ A _ _ / _ _ E_ E / T _ E / _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ A_ _ A A / _ O/ _ _ _ _ _ _ _ / _ _ .
There are three O’s.
_ / _ A _ _ A / _ O / _ A _ _ / T O / _ _ / _ _ TT_ E / _ _ A_ _ / _ _ A_ _ / _ _ / _ EA _ A_ E _ _ A , / _ A _ A _ _ / _ _ E_ E / T _ E / _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ A_ _ A A / _ O/ _ _ _ _ _ _ _ / _ _ .
There are three O’s.
And an ‘N’ or two. Or few.
I / _ A _ _ A / _ O / _ A _ _ / T O / _ _ / _ ITT_ E / _ _ A_ _ / _ _ A_ _ / I _ / _ EA _ A_ E _ _ A , / _ A _ A II / _ _ E_ E / T _ E / _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ A_ _ A A / _ O/ _ _ I _ _ _ _ / _ _ .
And some I’s. And, yes, a 21-letter word ending in double A, going hand in hand with the 6-letter word ending in AII.
I / _ A NN A / _ O / _ A _ _ / T O / _ _ / _ ITT_ E / _ _ A_ _ / _ _ A_ _ / I N / _ EA _ A_ E _ _ A , / _ A _ A II / _ _ E_ E / T _ E / _ _ _ _ _ _ _ _ N _ _ _ N_ _ _ A _ _ A A / _ O/ _ _ I _ _ N _ / _ _ .
And maybe some N’s will help.
An ‘L’…?
I / _ A NN A / _ O / _ A _ _ / T O / _ _ / LITTLE / _ _ A_ _ / _ _ A_ _ / I N / _ EA LA_ E _ _ A , / _ A _ A II / _ _ E_ E / T _ E / _ _ _ _ _ _ _ _ N _ _ _ N_ _ _ A _ _ A A / _ O/ _ _ I _ _ N _ / _ _ .
Three L’s.
Gotta be a W.
I / WA NN A / _ O / _ A _ _ / T O / _ _ / LITTLE / _ _ A_ _ / _ _ A_ _ / I N / _ EA LA_ E _ _ A , / _ A WA II / W _ E_ E / T _ E / _ _ _ _ _ _ _ _ N _ _ _ N_ _ _ A _ _ A A / _ O/ _ W I _ _ N _ / _ _ .
You are correct, sir.
G, I wonder if a g is in there?
I also want a ‘U’ I think I know what that long word is!
I was going to comment that if it weren’t for the Ts I’d suspect that this sentence was in Hawaiian, not English, but I now see that an ‘H’ is needed. 
Hey, brah, you got one ‘S’ I can have?. (Another non-Hawaiian letter, by the way.)
I / WA NN A / GO / _ A _ _ / T O / _ _ / LITTLE / G _ ASS / S HA_ _ / I N / _ EA LA_ E _ UA , / HAWAII / WH E_ E / T HE / HU _ U HU _ U N U _ U N U_ U A _ U A A / GO/ SW I _ _ N G / _ _ .
Everybody Sing!
I don’t know the song, but I know how to spell that long word!
M next!
I / WA NN A / GO / _ A _ _ / T O / M _ / LITTLE / G _ ASS / S HA_ _ / I N / _ EA LA_ E _ UA , / HAWAII / WH E_ E / T HE / HUMUHUMU N U _ U N U_ U A _ U A A / GO/ SWIMMIN G / _ _ .
Yes, that long word was “swimming”.
I think you need an `okina in that ridiculously long word.
(Of course, there really should be one in “Hawai`i”, too…)
I never heard of the song, but a couple of Ks would be good.
I / WA NN A / GO / _ A _ K / TO / M _ / LITTLE / G _ ASS / S HA_ K / I N / KEALAKEKUA , / HAWAII / WHE_ E / T HE / HUMUHUMUNUKUNUKUA _ U A A / GO/ SWIMMIN G / _ _ .
Numerous K’s. The okinas don’t seem to appear in the sheet music.
‘C’ here… Let’s do some fill in.
And ‘B’.