David Essex is an English singer-songwriter and actor. From 1973 to 1994, he had 19 Top 40 singles in the UK and 16 Top 40 albums. Internationally, Essex had the most success with his 1973 single "Rock On". He has also had an extensive career as an actor.

"Rock On" is a song written by English singer David Essex. Recorded in 1973 and released as a single by Essex, it became an international hit. In 1989, American actor and singer Michael Damian recorded a cover version that went to number one on the Billboard Hot 100 chart. The song has been recorded many times, including a 2006 version by the English hard rock group Def Leppard.