Monday was Julian Lennon's 50th birthday, and in celebration he posted a video on his Facebook page for his new song, "Someday," featuring Steven Tyler on background vocals. The video shows clips of The Beatles, Tyler and many who tried to make this world a better place, including Martin Luther King, Mother Teresa, Dalai Lama and Gandhi. Tyler can be heard singing the line, "How does it feel to be one of the beautiful people," which is from The Beatles' song, "Baby You're a Rich Man."

Julian's step mother, Yoko Ono, posted a birthday greeting to him on Twitter as well as a link to the song.

Last fall, John Lennon's son with Yoko, Sean Lennon, joined Aerosmith on stage in New York for The Beatles' "Come Together."