When I sing for myself, I sing in a more free, athletic way. When I face an audience, there is always some fear that makes me put the brakes on a bit.

To sing a duet together means sharing with someone both the pleasure and the responsibility of making music for an audience which is there to feel enjoyment through music.

Every audience has its character; I like America - they love me. I suffer from stage fright, but in America not so much.

I don't know if One Direction will stand the test of time. I have a niece who goes crazy for them. But the only way to judge art is to wait and see if it becomes evergreen. This takes a bit of time. Adele is a very good musician and I'd like to sing with her. But, again, time will tell if her music will become evergreen.

To sing a song is like whispering to a child's ear. It is an art heavily relying on improvisation.

I also always carry my flute. It's very important for me to try to relax when I'm travelling, and playing my flute helps me to unwind.