Radiohead's Thom Yorke says he's "so very sad" to hear of the death of Scott Walker at the age of 76.
He's credited with being one of music's most influential singer-songwriters.
In the 1960s he had hits including The Sun Ain't Gonna Shine Anymore and Make It Easy On Yourself as part of the Walker Brothers.
Marc Almond's described Walker as "musical genius".