I thought I would mention him here, as he is a very talented musician, but is ultimately lost in his father's shadow. Which is tough, because Sean is extremely talented.
His sophmore album "Friendly Fire" was just released about a month ago, and I absolutely love it. You can definitely tell he is John Lennon's son, with his almost nasally, yet sweet voice. The lyrics, I think are easier to divulge than in his debut album "Into The Sun." The album is supposed to reflect heartbreak, and loss, which I think it accomplishes very well.
However, if you are not a fan of The Beatles, or a fan of more of the Indie/Emo type music, then I wouldn't recommend this to you. But for the others, I recommend it. There are reminisces of The Beatles days, Sean sounds like his father, but with more sadness then his father ever held. Songs such as "Dead Meat", "Wait For Me" and "Headlights" are very good.
So I recommend it.
Here's the video for "Dead Meat"-
Dead Meat- Sean Lennon