Rhythm and blues, soulful and honest music, originated in the United States during the 1940s. R&B has changed over the last eight decades, but few genres of popular music have highlighted the power, grace, and diversity of the human voice like R&B. The list is vast and filled with iconic names that have survived the test of time. But which names will make the definitive list of the greatest female R&B voices of the 20th century? The siblings get sideways once again arguing about which names top this amazing list!