Air Supply had a string of hits during the first half of the 1980s with a series of soft rock and power ballads which became staples on mainstream oriented radio. Their first greatest hits album, released in 1983, peaked at #7 on the U.S. charts and remains the definitive survey of the most successful portion of their career. The later 1999 Definitive Collection contains all of the songs from the earlier Greatest Hits compilation, along with eight additional singles and an alternate version of "Lost In Love" from their 1979 Australian release Life Support. In this review, I am only comparing the nine songs which are common to both collections.