Singer John is a term that refers to two popular singers, Elton and Oates. Elton John is an English singer-songwriter, composer, pianist, and record producer who has sold more than 300 million records, making him one of the best-selling music artists of all time. Daryl Hall and John Oates, commonly known as Hall & Oates, are an American musical duo from Philadelphia. They achieved their greatest fame in the late 1970s and early to mid-1980s with a fusion of rock and roll and rhythm and blues.