How about Peter Pan's "I Gotta Crow":
(This is from memory, definitely incomplete & not entirely accurate, don't quote me on the details ... )
I gotta crow - er er er oo!
I'm just the cleverest boy it was ever my fortune to know!
I gotta crow - er er er ee!
When I discover the cleverness of a remarkable me!
(and it goes on in this vein for quite a number of verses)