Sadly the most famous pop sampling - at the start of the Beatles' 1967 hit "All You Need is Love" - is left out for copyright reasons, though there are copious notes in the accompanying book.

BBC: Jazzing up the Marseillaise

But at one time or another, we have all been left behind while the one we love has gone off to train for battle, or keep the peace, or wage war.

NPR: Waiting and Dreading: Families in War Time