There's something a little odd going on. Sting comes off stage after his Bergen concert, hits the hotel bar and opens a bottle of Chablis. And then he talks about 18th century keyboard music. I suppose I started it. There's a song of his I particularly like for its harmonic interest: 'Whenever I Say Your Name', a duet with the American R&B star Mary J Blige from his 2203 album 'Sacred Love'. So I ask him about it. "It's based entirely on Bach," he reveals, not without a little pride in his voice. "Look at the bass line and you'll see it's all him. It's one of his preludes - in C, I think..."