Im sure you can tell by his last name he is the son of the late John Lennon (Beatles), his first son to his first marriage to be exact. Dont get Julian mixed up with the son John had with Yoko Sean.
Anyways I remember back in 85 Julian put an album out that did really good andf then he disappered. Well anyways I guess he put another album out in 99 and if you have not heard it the guy sounds just like John, it's kinda scary actually, his music even has a little bit of that Beatles feel to it.
Check it out:
"Day After Day"
"I Should Have Known"
"I Dont Want To Know"