by cindy grogan July 23, 2016 Comments1 Hear What Happened to the Pop Duo? Hall and Oates. Marvin Gaye and Tammi Terrell. Sonny & Cher. Simon & Garfunkel. Pop duos used to be popular and successful. What’s changed? by Ken Hymes May 23, 2016 Comments8 Hear The List of Mystifying Hits Everyone knows a song or two with lyrics that defy logic. Let the debate begin over which ones belong on this list of hard-to-explain hits.