Here are some of the reactions:
Paul on @DavidBowieReal https://t.co/KVxmjBdYT1 pic.twitter.com/aNJi3BjAuv
— Paul McCartney (@PaulMcCartney) January 11, 2016I'm devastated. David Bowie changed the course of my life forever. I never felt like I fit in growing up in... https://t.co/D1GnQzIRqw
— Madonna (@Madonna) January 11, 2016The Rolling Stones are shocked and deeply saddened to hear of the death of our dear friend David Bowie... 1/2
— The Rolling Stones (@RollingStones) January 11, 2016As well as being a wonderful and kind man, he was an extraordinary artist, and a true original. 2/2 #DavidBowie
— The Rolling Stones (@RollingStones) January 11, 2016David was always an inspiration to me and a true original. He was wonderfully shameless in his work. 1/2
— Mick Jagger (@MickJagger) January 11, 2016We had so many good times together. He was my friend, I will never forget him. 2/2 pic.twitter.com/9xfPj88x8b
— Mick Jagger (@MickJagger) January 11, 2016MESSAGE FROM IGGY: "David's friendship was the light of my life. I never met such a brilliant person. He was the best there is. - Iggy Pop"
— Iggy Pop (@IggyPop) January 11, 2016David Bowie was one of my most important inspirations, so fearless, so creative, he gave us magic for a lifetime.
— KANYE WEST (@kanyewest) January 11, 2016David Bowie was a true innovator, a true creative. May he rest in peace #RIPDavidBowie
— Pharrell Williams (@Pharrell) January 11, 2016I'm sorry but I'm just not able to accept that David Bowie is gone. It doesn't feel real. It'll take time. He's immortal to me. He was King.
— Margaret Cho (@margaretcho) January 12, 2016Shocked and sad to hear about the passing of David Bowie. He was the definition of cool. A true pioneer, a fearless trailblazer. #RIP
— Neil Patrick Harris (@ActuallyNPH) January 12, 2016One of a kind. Was honored to have spent time in his company, Rest in peace #DavidBowie K pic.twitter.com/PBnBs2ajGW
— Kevin Spacey (@KevinSpacey) January 12, 2016Rip Father of all us freaks. Sad sad day. Love always Legendary singer David Bowie dies at 69 https://t.co/ezRx7NVhSC # via HuffPostEnt
— Mark Ruffalo (@MarkRuffalo) January 11, 2016This is the only uncool thing David Bowie has ever done.
— Jen Kirkman (@JenKirkman) January 11, 2016#DavidBowie Thank you for coming down to meet us. I think you blew our minds.
— Jamie Bamber (@ImJamieBamber) January 11, 2016I love how we all found Bowie at different times, and all met a different person. He was a Time Lord, and we were briefly his companions.
— James Moran (@jamesmoran) January 11, 2016"I don't know where I'm going from here, but I promise it won't be boring." - David Bowie, who gave us all so much. RIP.
— Ronan Farrow (@RonanFarrow) January 11, 2016