I loove Amy Winehouse she is an amazing soul/R&B singer and although she has a great voice, some of her troubled personality shines through into her music.
For instance, there is a few uses of sh_t and f__k, some suggestive references to sex, and also some drugs, as she has come out as a drug addict. Parents may wish to discuss with their child about drugs and sexual issues, as well as the importance of not letting yourself take drugs.
Some of the sexual stuff will go over their heads, but overall if they are mature and are into R &B, go for it!! :) I highly reccomend it for 12+