Olivia Newton-John's 2013 volume of Universal's ongoing budget-line hits series Icon does a terrific job of rounding up her 11 biggest hits. Perhaps there is nothing from Grease here -- an omission that prevents this affordable set from being definitive -- but this does contains her soft rock and country-rock hits from the '70s ("Have You Never Been Mellow," "Let Me Be There," "Please Mr. Please," "I Honestly Love You") and the glitzy, disco-inspired soft rock of the '80s ("Magic," "Physical," "A Little More Love," "Heart Attack," "Xanadu," "Make a Move on Me"), resulting in what is arguably the very best of her very best.