John Charles Julian Lennon (born 8 April 1963) is a British musician, songwriter, actor, and photographer. He is the son of John Lennon and Lennon's first wife, Cynthia Powell. Beatles manager Brian Epstein was his godfather. He has a younger half-brother, Sean Lennon. Lennon was named after his paternal grandmother, Julia. He remains close friends with his father's former bandmate Paul McCartney.

Julian directly inspired three Beatles songs: "Lucy in the Sky with Diamonds", "Hey Jude" and "Good Night". He is also devoted to philanthropic endeavors, most notably his own White Feather Foundation and the Whaledreamers Organization, both of which promote the co-existence of all species and the health and well-being of the Earth.

His sixth studio album Everything Changes was released on 3 October 2011.

Julian Lennon was born in Liverpool. Initially, the fact that John Lennon was married and had a child was concealed from the public, in keeping with the conventional wisdom of the era that female teenage fans would not be as enamoured of married male pop stars.

Yoko Ono (オノ・ヨーコ（小野 洋子）, Ono Yōko^?, born February 18, 1933) is a Japanese artist, author, and peace activist, known for her work in avant-garde art, music and filmmaking as well as her marriage to John Lennon. Ono brought feminism to the forefront in her music which prefigured New Wave music and is known for her philanthropic contributions to the arts, peace and AIDS outreach programs.

Yoko Ono was born in Tokyo in 1933 to mother Isoko Ono, the great-granddaughter of Zenjiro Yasuda of the Yasuda banking family, and to father Yeisuke Ono, a banker and one-time classical pianist who was a descendant of an Emperor of Japan. The name "Yoko" means "ocean child". Two weeks before she was born, her father was transferred to San Francisco by his employer, the Yokohama Specie Bank. The rest of the family followed soon after and Yoko met her father when she was two. Her younger brother Keisuke was born in December 1936. In 1937, her father was transferred back to Japan and Ono was enrolled at Tokyo's Gakushuin (also known as the Peers School), one of the most exclusive schools in Japan.

John Winston Ono Lennon, MBE (9 October 1940 – 8 December 1980) was an English musician and singer-songwriter who rose to worldwide fame as one of the founder members of The Beatles, one of the most commercially successful and critically acclaimed acts in the history of popular music. Together with Paul McCartney, he formed one of the most celebrated songwriting partnerships of the 20th century.

Born and raised in Liverpool, Lennon became involved as a teenager in the skiffle craze; his first band, The Quarrymen, evolved into The Beatles in 1960. As the group disintegrated towards the end of the decade, Lennon embarked on a solo career that produced the critically acclaimed albums John Lennon/Plastic Ono Band and Imagine, and iconic songs such as "Give Peace a Chance" and "Imagine". After his marriage to Yoko Ono in 1969, he changed his name to John Ono Lennon. Lennon disengaged himself from the music business in 1975 to devote time to raising his infant son Sean, but re-emerged with Ono in 1980 with the new album Double Fantasy. He was murdered three weeks after its release.

Sir James Paul McCartney, MBE, Hon RAM, FRCM (born 18 June 1942) is an English musician, singer-songwriter and composer. Formerly of the Beatles (1960–1970) and Wings (1971–1981), he has been described by Guinness World Records as "The Most Successful Composer and Recording Artist of All Time", with 60 gold discs and sales of over 100 million albums and 100 million singles. With John Lennon, George Harrison, and Ringo Starr, he gained worldwide fame as a member of the Beatles, and with Lennon formed one of the most celebrated songwriting partnerships of the 20th century. After leaving the Beatles, he began a solo career and later formed the band Wings with his first wife, Linda Eastman, and singer-songwriter Denny Laine.

According to the BBC, his Beatles song "Yesterday" has been covered by over 2,200 artists—more than any other song. Wings' 1977 release, "Mull of Kintyre", became one of the best-selling singles ever in the UK, and he is "the most successful songwriter" in UK chart history, according to Guinness. As a songwriter or co-writer, he is included on thirty-one number one titles on the Billboard Hot 100, and as of 2012 he has sold over 15.5 million RIAA certified units in the United States.

Steven Tyler (born Steven Victor Tallaricco; March 26, 1948) is an American singer, songwriter, and multi-instrumentalist, best known as the frontman and lead singer of the Boston-based rock band Aerosmith, in which he also plays the harmonica, and occasional piano and percussion. He is known as the "Demon of Screamin'" due to his high screams and his wide vocal range. He is also known for his on-stage acrobatics. During his high-energy performances, he usually dresses in bright, colorful outfits with his trademark scarves hanging from his microphone stand. In the 1970s, Tyler rose to prominence as the frontman of Aerosmith, which released such milestone hard rock albums as Toys in the Attic and Rocks. In the late 1970s and early 1980s, Tyler had a heavy drug and alcohol addiction, and the band's popularity waned.

He completed drug rehabilitation in 1986 and subsequently maintained sobriety for years, but had a relapse with prescription painkillers in the late 2000s, for which he successfully received treatment in 2009. After Aerosmith launched a remarkable comeback in the late 1980s and early 1990s with the albums Permanent Vacation, Pump, and Get a Grip, Tyler became a household name and has remained a relevant rock icon. As a result, he has since embarked on several solo endeavors including guest appearances on other artists' music, film and TV roles (including as a judge on American Idol), authoring a bestselling book, and solo work (including a Top 40 hit single in 2011). However, he has continued to record music and perform with Aerosmith, after more than 41 years in the band. He is included among Rolling Stone's 100 Greatest Singers. He was also ranked 3rd on Hit Parader's Top 100 Metal Vocalists of All Time. In 2001 he was inducted into the Rock and Roll Hall of Fame with Aerosmith, and he was the presenter when AC/DC was inducted into the Hall of Fame in 2003.