We lost lot of good singers lately, Helen Ruddy, Eddie Van Halen and now Johnny Nash who hit a #1 hit on Billboard with his song "I can see clearly now" in 1972 and according to IMDB, he also sing the theme song of the 1960s cartoon "The Mighty Hercules".
https://www.theglobeandmail.com/arts/music/article-singer-johnny-nash-best-known-for-i-can-see-clearly-now-dies-at-80/