i have a Amy Winehouse station on Pandora, usually the artist that pop up are Adele, Duffy annnd...i forgot, but after that Pandora just goes off track. By that i mean artist like Micheal Jackson pops up soo i want real responses from humans.
Winehouse and Adele both draw a lot from classic soul and 60's girl groups, so there's a whole goldmine for you there. Might check out Dion Warwick, Ruby & the Romantics(who Winehouse covered), Gloria Jones, Rose Batiste etc.
That's the roots for those singers, so that's always a good place to start.
I don't see how Amy Winehouse fits in this subforum. I thought this was the subforum for the more erudite forms of music. Winehouse clearly is popular music.