Some of Demis Roussos' greatest hits include "Forever And Ever," "Midnight Is the Time I Need You," "Goodbye, My Love, Goodbye" and "That Once in a Lifetime," among others. Six of his singles have been featured in the UK Top 40 Singles Chart.
The "Roussos Phenomenon" EP, released in 1976, was one of his most successful recordings, spending a week at the top of the UK Singles Chart. It was also the only EP to reach the top of the charts that decade. "That Once in a Lifetime" peaked at 47 on the US Billboard Top 100. Demis Roussos had an active music career and made a total of 293 recordings prior to his death in 2015.