Tracks on Sean Lennon's new album were inspired by the rocker's heartbreaking split with an ex-girlfriend after she cheated on him with his best friend. Lennon, the son of late BEATLE John Lennon and Yoko Ono, admits the songwriting experience that became new album FRIENDLY FIRE was very cathartic. He tells Billboard.com, "Basically, all the songs are pretty recent. They're all about my relationship with my ex-girlfriend and its demise, and also my best friend having had an affair with her. "It was kind of beautiful to write about it." Lennon refuses to reveal the identity of his ex, or the identity of his friend, who slept with her. The recording process also gave Lennon the chance to work with an old pal - Paul Simon's son HARPER, who plays guitar on the album. Lennon explains, "He's been my friend since we were kids. In the last couple of years, we discovered that playing together was also cool. He's a very talented guy."