The Beatles' last song Now And Then is finally released

After a week of build-up, The Beatles have released what's been billed as their "final song". 

Called Now And Then, it's been 45 years in the making - with the first bars written by John Lennon in 1978 and the song finally completed last year. 

The Beatles had 20 number 1 Billboard Hot 100 hits, including “Hey Jude,” “Come Together,” “Let It Be,” “Help!” and “Yesterday.” Other known timeless tracks include “Twist and Shout” and “Here Comes the Sun.”