It is subjective and a matter of personal opinion.
When the name Oleta Adams is heard many people think of her work done in the Jazz genre of music. Oleta was a great musician and won the R&B single award in 1994.
Billy Preston is a famous American musician, who's work included rock, soul, R&B, funk and gospel. He started off as a regular session musician with people such as Ray Charles.
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Keith Richards is a musician and a member of The Rolling Stones. Robert Plant
There is not really an America's best female r&b singer.
There are numerous famous people with the name of Roy Brown. One such was a Montana state Senator. Another Roy Brown was a blues and R&B musician who died in 1981.
Beyonce is not a rock musician; she is a hip-hop artist.
Beyoncé has won Grammys in the following categories: Best R&B Performance by a Duo or Group with Vocals, Best R&B Song, Best Contemporary R&B Album, Best Rap/Sung Collaboration, Best Female R&B Vocal Performance, Best Female Pop Vocal Performance, Song of the Year, Best Traditional R&B Vocal Performance, Best Surround Sound Album, and Best R&B Performance.
R&b
She won two with Destiny's Child, the Best R&B Performance by a Duo or Group with Vocals and the Best R&B Song at the 2001 Grammy Awards for 'Say My Name.'
Wonderful by R Kelly
the best r&b star of pop is usher after training Justin bieber