Bola Sete is a great one. I especially liked his playing with Vince Giraldi (sp?), my memory is not betraying me, no? However isn't he, like many of these, a great guitarist, but well within one genre. Mark Knoffler comes to mind here for his work on various soundtracts, Dire Straits, Chet Atkins duets and the Notting Hillbillies, but I think that the guy that mentioned Tedesco has this thread pegged.