Julian Lennon, Steven Tyler Duet Due

The recent Julian Lennon duet with Aerosmith's Steven Tyler, called "Someday," will be released to iTunes on Lennon's 50th birthday on April 8th, according to Beatles Examiner. Lennon said in a press release "2013 highlights another year of inspiration for me, in regards to my music, photography and philanthropy work, and 'Someday' is a reflection of that." Lennon added that his most recent album, 2011's Everything Changes would also be seeing a U.S. release this spring.

This isn't the first team-up to be released between Lennon and Tyler, with Lennon appearing on last year's Aerosmith track, "Love XXX," from their Music From Another Dimension album. Tyler recalled how he and Lennon came to collaborate, telling The London Evening Standard: "A lot of stuff happens in L.A. We were staying at a hotel where Julian Lennon was staying, and one morning I was singing in the shower. The window was open, and I just heard, 'Steven?' We brought him over to the studio and he sang on the opening track."