Speaking to the Camden New Journal, Chang said: 'We’d been writing quite a lot of pop tunes, doing a lot of pop promos with various artists who would come in, many of various, dubious talent. It was at a particularly dire time in the pop world – lots of terrible, terrible girl bands and boy bands and we had to make something for them.'

'Amy came in to see us, opened her mouth and just blew us all away. We were struck immediately by her talent – it was a real jaw on the floor moment. We were like wow, yes.'

Amy's former label boss at Universal Music, David Joseph said in the past that numerous demos from the star had been destroyed, in order to stop any possibility of a release after her death.