Mumford & Sons' music appeals to a lot of America. I'm really proud of them.

I met Prince William at a musical festival and he let me know he was a fan of my music. But the invitation to sing at his wedding reception came completely out of the blue. The fact that Kate and William knew the words to my songs was very touching.

Something funny always happens in every show in the UK and I genuinely love touring the UK because it's where I'm from. I just get a warm feeling when I'm home.

There are so many things to think about when you make an album. Like, who am I trying to impress? Am I going to get respect, critical acclaim? Or am I going to sell lots of records?

I instinctively dress a bit tougher because I've spent a lot of time in the U.S. and I realised there was a certain image projected of me here. I've always been an absolute rebel. When I was in my teen years I had piercings and wore all black.

Stuff just comes out all the time, sometimes when I sing live it really comes alive and I sort of... I write songs and then almost... not forget about it, but live it really comes out and I suddenly realise what I've written. I don't know where it all comes from.

When I heard Bjork's debut, that was when I first realized that I could be a singer, even with my unusual voice.