Amy Winehouse was an immensely talented, and soulful, singer.
Here are two videos of live performances she gave; both are of her superb song, "Rehab."
http://www.youtube.com/watch?v=eG61N6OhRWE&feature=related
The second performance is a more intimate, and more minimal, version of the song; she is accompanied by only two musicians.
http://www.youtube.com/watch?v=9tshDCsBKUU&feature=related