Paul McCartney wrote "A World Without Love" while living with his girlfriend,&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/actress-Jane-Asher/dp/B001KVD8IY/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">actress Jane Asher</a>&nbsp;(Peter's sister).  When the Beatles formed, John Lennon disliked the song and Paul gave it to Peter who recorded it with his friend Gordon Waller.  The song went straight to number one and became a part of the British Invasion, launching the career of Peter & Gordon.