She just sounded completely different.
Winehouse's public battle with drug and alcohol addiction, and subsequent death, have contributed to the song's continuing popularity and appearance in the media.
Unfortunately, alcoholics too often turn the realistic need to enter rehab into a battle between themselves and anyone who is urging treatment.
It's probably fair to say that most British celebrities of note have to struggle with unwanted attention from the country's tabloids at some point in their careers.
I think both John Belushi and Gilda Radner would have been some of her biggest fans.
Another example is the use of a 'wall of sound' production style, created by Phil Spector and used often during the 60's.