Since interviewing the four members of ABBA for an article in 2013 - at which time they had not been interviewed for 30 years - a relationship was sparked between writer Jan Gradvall and the band, and he was granted unique access for the next decade. He has interviewed each of them exclusively for 'The Book of ABBA', and they share their thoughts and opinions with him here more openly than ever before. Gradvall places ABBA at the centre of the musical universe, and alongside his fascinating interviews, he gives readers the socio-cultural context of how the band's sound was formed - including the melancholic hints of Swedish folk music and the dansband culture of their formative years - and shows how the story of ABBA is also the story of Sweden and the internationalisation of pop culture.