Olivia Newton John to Perry Como in 8 Steps
- Olivia Newton John is in the cast of Grease
- Grease cast includes John Travolta
- John Travolta is one of many artists that recorded It Had to Be You
- It Had to Be You was written by Gus Kahn
- Gus Kahn wrote Makin' Whoopee
- Makin' Whoopee was sung by Harry Nilsson
- Harry Nilsson wrote Don't Leave Me
- Don't Leave Me was recorded by Perry Como