Ah, Blondie. Those happy days of glorious power pop, chilly disco and rich, fruity vocals — Debbie Harry yearning away like a very bad alleycat on heat. ‘X Offender’, ‘In the Flesh’, ‘Picture This’ and that one where she’s in the phone booth, apparently gagging for it. People knock it, but the late 1970s wasn’t a bad time to be a teenager.