Highly underrated; most folks immediately go for "Back to Black" (it's genius lessons, so I get it) but "I Heard Love is Blind" is amazing AND pretty much HER composition. Right down to the guitar playing. We lost a major talent, way back when.
I love Amy Winehouse and recently borrowed the Frank CD from the library (from a pi.fyi rec!) All the tracks are still divine... Her storytelling and lyricism, so good, so devastating.