More than one person has called the Skyliners the greatest vocal group of all time, and although every act has their fans, that kind of praise is telling. The group's 1959 hit "Since I Don't Have You" is one of the most sublime, mood-setting singles of its era, and it's no wonder it has been so widely used in motion pictures. 40th Anniversary Collection is a two-disc set filled with 40 cross-licensed tracks that trace the group's history from the '50s through the '70s, including every chart hit along the way. The attention to detail makes this one of the best packages Collectables has assembled. Many buyers will be content with a simple best-of collection, but 40th Anniversary Edition is an excellent expanded anthology for those who want to take a closer look than a single disc can provide.