Amy Winehouse's family will not release any more of the singer's unheard music unless it is "comparable" with her earlier hit records.
The star's father, Mitch, said it was a difficult decision to release the new album, which features outtakes, two completely new songs and a demo, in time for this Christmas.
"The family view was nothing was going to go out unless it was comparable to Frank or Back to Black. If it wasn't as good as that then we wouldn't have allowed it to go out," he said.
Winehouse said sitting down to listen to the album, called Lioness: Hidden Treasures, was hard.
"On one hand it was very difficult for us to listen to the album, on the other hand we had to do it to ensure the quality was as it should be," he said.