A plaque paying tribute to late Beatles legend John Lennon has been unveiled by his widow Yoko Ono at the first home the couple shared in London. The blue sign has been placed at the property in the city's Montagu Square, where the pair lived in 1968. Lennon's bandmates Ringo Starr and Paul MCCartney, as well as Jimi Hendrix, also resided at the house at one time.