Uncle Ernie:

I'm your wicked Uncle Ernie
I'm glad you won't see or hear me
As I fiddle about
Fiddle about
Fiddle about !

Your mother left me here to mind you
Now I'm doing what I want to
Fiddling about
Fiddling about
Fiddle about!

Down with the bedclothes
Up with the nightshirt!
Fiddle about
Fiddle about
Fiddle about !

You won't shout as I fiddle about
Fiddle about
Fiddle about
Fiddle about !
Fiddle, fiddle, fiddle.

This song appears on the following albums:
Tommy(1969)
Live at the Isle of Wight Festival 1970(1970)
Join Together(1989)

Check out these videos of this song from YouTube:
Fiddle About - Tanglewood (1970)