 Lyrics for the shows theme song: 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 cant be sure at  all. / So, while youre here, enjoy the view; / keep on doing what  you do. / Hold on tight; well muddle through, / one day at a time,  one day at a time! / So, up on your feet; up on your feet; /  somewhere theres music playing. / Dont you worry none, / 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!