Perhaps I misunderstood the meaning of the thread, but I think we're supposed to name "singers", and neither Eminem, 2Pac nor Lil John are singers.
Truthfully, I love unique voices. Here are some of these gorgeous voices in no particular order. -Nina Simone -Renato Russo -Louis Armstrong -Freddie Mercury -Antony Hegarty -Mark Lanegan -Stephin Merritt -Nana Caymmi -Milton Nascimento -Nat King Cole -Billie Holiday