Released on the 1987 compilation Ultimate Air Supply, 'Goodbye' exemplifies the duo's signature blend of soulful vocals and polished pop-rock production. The track features Richard Marx and Graham Bonnet delivering harmonies that defined the era of soft rock and adult contemporary music. As a staple of their discography, the song captures the melancholic yet romantic tone characteristic of Air Supply's work during the late 1980s. It remains a recognizable piece within their catalogue, often associated with themes of parting and enduring love, reflecting the emotional depth that has sustained their popularity for decades.