Top U.S. Songs for Week Ending January 6, 1973: 'You're So Vain'

From Top 40 Weekly.com. 

That's right, fifty years ago.

1.  YOU'RE SO VAIN--  Carly Simon

2.  CLAIR--  Gilbert O'Sullivan

3.   ME AND MRS. JONES--  Billy Paul

4.  SUPERSTITION--  Stevie Wonder

5.  FUNNY FACE--  Donna Fargo

6.  IT NEVER RAINS IN SOUTHERN CALIFORNIA--   Albert Hammond

7.  ROCKIN' PNEUMONIA-- BOOGIE WOOGIE FLU--  Johnny Rivers

8.  YOUR MAMA DON'T DANCE--  Loggins & Messina

9.  SUPERFLY--  Curtis Mayfield

10.  YOU OUGHT TO BE WITH ME--  Al Green

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DEBUTS

29.  SUMMER BREEZE--  Seals & Crofts

32.  LONG DARK ROAD--  Hollies

36.  VENTURA HIGHWAY--  America

38.  I'M STONE IN LOVE WITH YOU--  Stylistics

39.  CRAZY HORSES--  Osmonds

Name That Tune (from the above songs):  "You Hop Into The Back Seat Where You Know It's Nice And Dark."  Answer below.  --RoadDog

"Your Mama Don't Dance"