Trouble is, there's so, so many wonderful singers. It all depends what mood I'm in and what type of music I feel like listening to..
But if I had to choose, then these would be my favourites I suppose,because I've listened to them repeatedly over the years , and still do.
Male: Sinatra, Bobby Darin, Bowie, Marvin Gaye, Donnie Hathaway, Prince, Jeff Buckley, Jim Morrison, Guy Garvey, Lennon/McCartney.
Female: Kate Bush, Ronnie Spector, KD Lang, Bjork, Joni Mitchell, Aretha Franklin, Jane Siberry, Alison Goldfrapp, Amy Winehouse, Minnie Ripperton.
Some brilliant names already mentioned above too!