Sing... Sing a Song...
Run (Run, Everybody Run)
One of These Things is not Like the Others
C is for Cookie
I Don't Want to Live on the Moon
La La La La Lemons
I Love Trash
The ABC song (that Big Bird sings, the one where he makes it all one word)
We are All Earthlings
It's Not Easy Being Green
Yes, I know there were a ton more. There are at least 3 CDs worth of them out in the world (I have the first one, but I wanted to go by memory this time, instead of looking for tips).
The point is that they were wonderful. And they were sweet. And they told stories. And they taught me things. And I remember them to this day. And... well... life wouldn't be the same without them.