"John and David respected each other. They were well matched in intellect and talent. As John and I had very few friends we felt David was as close as family.
After John died, David was always there for Sean and me. When Sean was at boarding school in Switzerland, David would pick him up and take him on trips to museums and let Sean hang out at his recording studio in Geneva.
For Sean this is losing another father figure. It will be hard for him, I know. But we have some sweet memories which will stay with us forever."
Brian Eno worked with Bowie on albums including his legendary Berlin Trilogy in the mid-1970s. He has issued a statement paying tribute to his friend:
"David's death came as a complete surprise, as did nearly everything else about him. I feel a huge gap now.
"We knew each other for over 40 years, in a friendship that was always tinged by echoes of Pete and Dud. Over the last few years - with him living in New York and me in London - our connection was by email. We signed off with invented names: some of his were mr showbiz, milton keynes, rhoda borrocks and the duke of ear.
"About a year ago we started talking about Outside - the last album we worked on together. We both liked that album a lot and felt that it had fallen through the cracks. We talked about revisiting it, taking it somewhere new. I was looking forward to that.
"I received an email from him seven days ago. It was as funny as always, and as surreal, looping through word games and allusions and all the usual stuff we did. It ended with this sentence: 'Thank you for our good times, brian. they will never rot'. And it was signed 'Dawn'.
"I realise now he was saying goodbye."
Iggy Pop and David Bowie became good friends in the mid-1970s, relocating to Berlin together as Bowie helped write and produce Pop's first two solo albums, while Pop fed into Bowie's albums including Low. Iggy Pop tweeted:
"David's friendship was the light of my life. I never met such a brilliant person. He was the best there is."
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