The singer of the song 'What's Going On' is Marvin Gaye, a four-letter word. Marvin Gaye was an American singer, songwriter, and record producer who achieved international fame for his work in soul, R&B, and pop music. He was one of the most successful and influential musicians of the 20th century, and his work has been covered by numerous artists. Gaye's career spanned more than four decades, and he was inducted into the Rock and Roll Hall of Fame in 1987.