Warren Zevon was a unique guy, son of a russian Mobster who was Best Man for Myer Lansky's wedding, a real genius, a horrible drunk, before cleaning up and wrote some incredible songs knowing of his imminent demise:
https://www.youtube.com/watch?v=qHDdqubE7zQ
https://www.youtube.com/watch?v=RMTKb-pgxGI