Seán Taro Ono Lennon was born October 9, 1975 and is an American singer, songwriter, musician, guitarist and actor. He is the only son of John Lennon and Yoko Ono. His godfather is Elton John.

Seán Lennon was born in New York City  on October 9, 1975, his father's 35th birthday. Julian Lennon is his half-brother and Kyoko Chan Cox is his half-sister. After Sean's birth, John became a house husband, doting on his young son until his murder in 1980. Sean was educated at the exclusive private boarding school Institut Le Rosey in Rolle, Switzerland, and earlier at New York's private Ethical Culture Fieldston School and Dalton School. He later attended Columbia University, though only for three semesters before dropping out to focus on his music career.

His parents did not force him into the life of a musician: they intentionally hid their musical lives from their son. His debut into the music world came at the age of five, reciting a story on his mother's 1981 album Season of Glass. From childhood into his teen years Sean continued to collaborate with his mother, contributing vocals and receiving production credit on her solo albums It's Alright (I See Rainbows), Starpeace and Onobox. At 16 Sean co-wrote the song "All I Ever Wanted" with Lenny Kravitz for his 1991 album Mama Said. By 1995 Sean had formed the band IMA (with Sam Koppelman and Timo Ellis) to play alongside his mother on her album Rising. Sean also made appearances in film, featured in the cast of Michael Jackson's 1988 Moonwalker and portraying a teenager experiencing visions of various M. C. Escher paintings in Sony's 1990 promotional short-film Infinite Escher.

In 1996 Miho Hatori and Yuka Honda of Cibo Matto were invited by Ono to remix the song "Talking to the Universe" for a Rising remix EP Rising Mixes. They met Sean and invited him to join them on tour as a bass player. This eventually led to Sean contributing to their side-project Butter 08  and to his becoming a member of the group. He continued to play with them on tour, joining them on television and providing bass guitar and vocals on their EP, Super Relax. Through his association with Cibo Matto, Lennon was approached by Adam Yauch (of the Beastie Boys), who expressed an interest in his music and persuaded him to sign a record contract with Grand Royal Records. Regarding Grand Royal, Lennon has said:

I think I found the only label on the planet who doesn't care who my parents are and what my name is. It's a good feeling to know that I wouldn't have gotten the offer if they wouldn't have liked my songs. That's pretty rare in the music business!

Lennon's solo début Into the Sun, was released in 1998. A music video for "Home", a single from the album, was directed by Spike Jonze and enjoyed extended airplay on MTV. The album was produced by fellow Cibo Matto member Yuka Honda, who Lennon claimed was his inspiration for the album. They struck up a personal relationship as well as a creative one.

He would go on to tour (often backed by Cibo Matto) supporting Into the Sun. During this period he appeared on radio programs such as The Howard Stern Show and KCRW's Morning Becomes Eclectic. He later recalled promoting the album as a bitter experience due to the media focus on his family rather than his own music. In 1999, Sean's EP Half Horse, Half Musician was released featuring new tracks such as "Heart & Lung" and "Happiness" as well as remixes of songs from Into The Sun. Along with Half Horse Half Musician 1999 saw the release of Cibo Matto's second album Stereo Type A. Sean stepped out of his traditional role as the group's bass player, this time playing a much wider range of instruments (such as drums, guitars and synthesizers). Despite being well received Stereo Type A was the final Cibo Matto album and the group disbanded.

In 2000 Lennon briefly entered the world of hip hop, contributing vocals to Del tha Funkee Homosapien, Handsome Boy Modeling School and Jurassic 5. In 2001 on national television, Sean performed Beatles classics "This Boy", "Across the Universe" and "Julia" alongside Robert Schwartzman, Rufus Wainwright and Moby for Come Together: A Night for John Lennon's Words and Music. In the following years Sean faded out of the spotlight. However he collaborated with various bands and artists as a session musician and producer.

After the demise of Grand Royal Records in 2001, Sean signed with Capitol Records (whose parent company EMI  has released the vast majority of his father's musical output, group and solo), yet no solo material surfaced until February 2006, when "Dead Meat" was released as the first single from his new album, Friendly Fire. A promotional trailer for the CD/DVD package of Friendly Fire was leaked online in early 2006. The trailer featured scenes from the film version of the album, a DVD of music videos comprised into a film. The videos were actually screen tests for Coin Locker Babies, another project on which Lennon is working which became a cinematic counterpart to his new album. The theme of the album is based around love and betrayal and was dedicated to the death of a close friend of his. Friendly Fire  was released in October 2006. The night the album was released, Lennon made his first major television appearance in five years, performing "Dead Meat" live on the Late Show with David Letterman. Lennon has since appeared on Late Night with Conan O'Brien and The Sharon Osbourne Show. When questioned about the eight-year gap between solo albums in interviews Lennon expressed that he did not feel like a solo artist during those years and that he wanted to experience music anonymously without the spotlight on him. Since the release of Friendly Fire, Lennon has been touring extensively around the world and while in France remixed his song "Parachute" in collaboration with French artist -M-. The remix is entitled "L'éclipse" and was featured as a bonus track on the French release of Friendly Fire.

Although again establishing himself as a solo artist, Lennon has continued his work as a session musician and producer, lending his talent to the likes of Dopo Yume, Albert Hammond, Jr. (of The Strokes) and model/singer Irina Lazareanu. In October 2007 Sean joined Mark Ronson in the BBC Electric Proms where he sang "Sail on, Sailor", as well as "We Can Work It Out" alongside Daniel Merriweather, and Tawiah. Along with girlfriend Charlotte Kemp Muhl, Sean started a record label, Chimera Music, and premiered the band The Ghost Of A Saber Tooth Tiger during a live performance at Radio City on Valentines Day, 2008. The duo, commonly referred to as 'The GOASTT', host their music on MySpace and perform under the aliases of Amatla and Zargifon. Their debut single, "Jardin Du Luxembourg", was released on July 6, 2010, on Chimera Music. Expanding on his musical output even further Sean has stepped into the world of film scores with Rosencrantz and Guildenstern Are Undead,directed by long time friend and school mate Jordan Galland With the release of new material and subsequent touring Sean launched a website featuring music, videos and a forum for his fans. Various members of the forum have even created a fan-made cover album entitled Truth Mask Replica. In a Youtube video released for his website (January 2008) Lennon has stated that he is working on a new solo album as well.

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