This collection contains all of Sonny's important British and American hits (with and without Cher) from 1964 to 1967, although some minor hits are missing. The classic hits here are I got you babe (number one in Britain and America), Laugh at me (a Sonny solo), Just you, Baby don't go, What now my love, Little man (number one in several European countries) and The beat goes on. There are many other wonderful songs including Sing c'est la vie, which was number one in Belgium but didn't chart at all (maybe wasn't released) in Britain or America.
Cher's solo hits from the sixties are omitted from this collection - you must buy either a separate Cher collection, or a more comprehensive Sonny and Cher collection to obtain those. For a comprehensive collection of the music of Sonny and Cher, buy the European double CD Singles plus, which contains all of Sonny and Cher's hits, separately and together, up to 1974. It comes at a price but if you're only interested in the early part of Cher's career, you won't need a separate Cher compilation.
If you are looking primarily for Sonny and Cher's duets and aren't bothered about the absence of Cher's solo hits, this is a great single CD.