Listing only ten is impossible for me, so here goes:

Kate Bush, Rufus Wainwright, Jeff Buckley, David Bowie, Choir of Young Believers, Trentemøller, Placebo, The Cure, Patrick Wolf, Arcade Fire, Prince, Band of Horses, The Killers, Gorillaz, Nina Simone, Jimi Hendrix, Scott Matthew, Joni Mitchell, The Raveonettes, Martha Wainwright, Johnny Cash, M.I.A., Amy Winehouse, Cat Power, Santogold, Nick Cave, Devendra Banhart, PJ Harvey, Lauryn Hill, Beirut, The Beatles, Yeah Yeah Yeahs, The Roots, Björk, Leonard Cohen, Lou Reed, Bob Dylan, Joanna Newsom, Sharon Jones & The Dap-Kings, Iron & Wine, Antony and the Johnsons, Tracy Chapman, Morrissey, Kashmir, The Flaming Lips, Daft Punk, Janis Joplin etc. etc. etc.