What criteria are we using? Some people are talking vocals, and others are talking body of work. Also, are we talking just male singers, or female singers, too? R&B/Soul is my field of expertise, so y'all can't come half-assed with this shyt. I like Tyrese. Dude is an underrated vocalist, and he has a few hits under his belt. However, to say he's one of the greatest R&B singers of the past 20 years is a stretch. Are you talking top 5? Top 10? I could listen to an argument for top 10, but not top 5.