As one of Sweden’s most prominent music journalists, Jan Gradvall has a close and fond relationship with his nation’s top musical export, Abba. In ‘The Book of Abba: Melancholy Undercover’, Gradvall explores the love, heartbreak and connections between each member of the pop group, from Eurovision to beyond. He sits down with Georgina Godwin to discuss his journalistic career, his former role as head of the Swedish Music Hall of Fame and the possibility of the pop group coming back again.