Olivia Newton-John has how many more Grammy wins than the number of performers in the Main Event Tour?
The Main Event (1998 concert tour): The Main Event Tour was a 1998 joint concert tour by Australian singers John Farnham, Olivia Newton-John and Anthony Warlow. Olivia Newton-John:  She starred in the musical film "Grease", and is one of the most successful in history, with the single You're the One That I Want, with John Travolta, one of the best selling singles.
i don't know