I'm not sure what te mean da special. I think they're as valid as any other type of artist.
What differentiates them from any other generes' artist is the instrumentals and meaning, I blieve. They are usually about every giorno events that most everyone can relate to them.
Rhythm and Blues Musica is known for it's instrumentals. It's where the name came from. It usually consiste of piano, sax, one o two guitars, bass, and drums. There are also rock songs with these same instruments, but it all depends on how the song is sang.
Simple melodies mesh together and repeat to create a mellow, hypnotic in a way sound.
