I'm going back to Sesame Street, here. This is one of my favorite songs, written by the Late, Great, Joe Raposo for the first season, back in 1969:


Sing
Sing a song
Sing out loud
Sing out strong
Sing of good things, not bad
Sing of happy, not sad

Sing
Sing a song
Make it simple
To last your whole life long
Don't worry that it's not good enough
For anyone else to hear
Just sing --
Sing a song.

And then, there's the classic written by David Axlerod and Sam Pottle (1974) that could be Mudcat's theme song:

(link to a YouTube video, from the Sesame Street Channel):

La-di-da-di-dum, la-di-da-dum...
What's the name of that song?
It goes la-di-da-di-dum, la-di-da-di-dum...
Something, something "Birds,"
La-di-da-dum, la-di-da-di--
I wish I remembered the words!