"She's Leaving Home" was indeed penned by Lennon and McCartney, and featured on Sergeabt Pepper album. It was covered also by Brian Ferry on a compilation LP, called "World War II and All That", which was a colletion of Beatles songs performed by other notables such as Rod Stewart, Jeff Lynne (ELO), and The Four Seasons
Thanks for all the answers folks, but I think I was not clear enough, the video clip was called 'she left home' not the song. I want to know what the song was-sounded quite modern.