Description "Till You Say You'll Be Mine/Forever" by Olivia Newton-John. Extremely rare Demonstration Sample - Not For Sale Vinyl 45 from 1966. The sleeve was autographed by Olivia this past summer in Las Vegas. This item is being auctioned with all proceeds going to the Olivia Newton-John Cancer and Wellness Centre. The fan who donated this rare, vintage record is parting ways with it to help the cause so near and dear to Olivia's heart.