Funny how random kids TV shows will stick with us like that...

Just for thoroughness, I've transcribed the lyrics from the archive.org link above. The last line of the chorus, denoted in brackets, changed slightly on each iteration of it.

THE GOONIE-BIRD SONG
(George Kleinsinger and Joe Darion)

Oh, once there was a goonie bird who lived in a big bell tower
And every time he tried to sing, the bells would ring the hour!
He opened up his little mouth and gayly flapped his wings

CHORUS
Then then great big bell went boom, bang
The middle-sized bell went clang-clang-clang
The little, little bell went tingle-tingle-ting
[And nobody heard that goonie bird sing]

He met a lady goonie bird and he began to woo her
He said "I'll make a lovely song, and I will sing it to her"
But when he opened up his mouth and started in to sing

CHORUS [And she never heard...]

The lady bird, she said to him, "I never cared for singing
But how I love your lovely voice, it sounds just like bells ringing"
And so he put a wedding band upon her pretty wing

CHORUS [And they were wed one morning in spring]

Boom, bang, clang-clang-clang, clink-clink-clink-clink-clink
They lived there without a care though nobody ever heard
That goonie bird sing
That goonie bird sing
That goonie bird sing
That goonie bird sing