I grew up with Abba. I know that’s kind of sad, I wasn’t a rock- and- roll- wild child, into heavy metal, or even a Satanist. I listened to the charts on the radio, but not religiously. The first album I ever thought about buying was ‘Bat Out of Hell’ and it had been Number 1 for about 50 weeks and I had to ask who the singer was. I was so uncool I watched the Eurovision Song Contest and I remember Abba winning it with Waterloo. Abba have sold...