Amy Winehouse had a beautiful voice and really smart backup producers and musicians that refreshed and rehashed old styles of music as new. Beautiful and enjoyable, but not groundbreaking.

As I really enjoy her take on jazz, a genre I'm not really a big fan of, it's groundbreaking as far as I'm concerned :-)

I wouldn't agree she had a beautiful voice, either (Julie Andrews has an incredible voice). It was the way she used it that was new and great. She wrote her own music, I don't think she was a tool of the music producers. I haven't heard anything like her take before or since.