Question: An Evening with Olivia Newton-John was which number concert tour by Australian singer Olivia Newton-John, the second leg began only in February 2009, with the opening concert having Barry Gibb  as special guest on some songs?
Sentence (from "An Evening with Olivia Newton-John"): An Evening with Olivia Newton-John was fifteenth concert tour by Australian singer Olivia Newton-John.
Relevant evidence: Yes