I just heard about it this morning and I'm shocked.

Evidently he's had cancer for about 18 months and family wanted to keep it under wraps. I heard on the radio this morning that he had a stroke earlier and that's when they discovered the cancer.
I did see a small clip of his upcoming album last week and thought he looked different but just assumed he looked older. For some reason it never occurred to me he was sick.
Anyway, I can't say I own all his music, but he surely was talented with his unique voice and in some cases different type sound/songs.
Off the top of my head, some favorites: Space Oddity, Young Americans, Let's Dance. I really did love he and Mick Jagger's Dancing in the Street.

RIP David Bowie
TIS