R&B is Rhythm and Blues
Sisqo is NOT R&B.
honestly, anything they have called R&B which was produced after 1999 just plain isn't R&B. It is pop music which is labeled incorrectly.
jodeci and Boyz2Men are borderline.
Boyz2Men is as close as pop music gets to actually being R&B.
Jodeci had one or two hit Pop songs which could be confused with R&B. The rest of their music was just pop.