Four Decades of Song is a three-CD compilation from Shirley Bassey issued in 1996. This set features 54 songs recorded between 1959 and 1993. In 2008 EMI repackaged and retitled this boxset as Shirley Bassey The Collection; the new version had six extra tracks. With the exception of "Secret Love" (track 13 on disc 3), all of these tracks were previously issued. This track was recorded in the mid-1960s but remained unreleased until 1996, and appears exclusively on this collection.