Man, this was one of my favorite sitcom songs. I almost forgot it!

This is it. This is it.
This is life, the one you get
So go and have a ball.

This is it. This is it
Straight ahead and rest assured
You can’t be sure at all.

So while you’re here enjoy the view
Keep on doing what you do
So hold on tight we'll muddle through
One day at a time, One day at a time.

So up on your feet. Up on your feet
Somewhere there’s music playing.
Don’t you worry none
We’ll just take it like it comes.

One day at a time, one day at a time.
One day at a time, one day at a time.
One day at a time, one day at a time.
One day at a time, one day at a time.

I always thought it was...

"So walk on the beat (walk on the beat),
Somewhere there's music playin..."