In his new book, Ian Leslie explores the close relationship between John Lennon and Paul McCartney and its demise.

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‘OK, that’s that. It’s over now,’ Björn Ulvaeus thought after Abba broke up in 1982. ‘But,’ as Chal Ravens writes in the latest LRB, ‘Björn’s zeitgeist detector was, as usual, on the blink.’ By the ...