there was a period (round about 1999-2001ish) when "RnB" (i hate that genre name, but can't think of a better one) seemed to be about to turn into something not just exciting, but also cybernetically freakish in a way reminiscent of nothing more describable than a hybrid of Sleng Teng era dancehall, early electro, bhangra and cybergoth/industial techno... except for having mostly female harmony vocals over it... sadly after a few seminal tunes it seemed to all go back to dull "smooth" pop again...
there was also some very very nice (if less startling) stuff happening around the same time in the neo-soul/neo-jazz/early-70s-Marvin-and-Curtis-reinterpreted-by-feminists side of the scene (Lauryn Hill and Erykah Badu being the obvious artists that went "overground" of it) before that started slipping back into the soppy-and-actually-quite-misogynistic-love-songs thing again...
i haven't actually listend to anything resembling "modern RnB" on the radio or whatever since about 2003, so those tunes i can think of are mostly from that approx 99-02 scene... again boundaries are fluid, so some may not consider all of these "RnB"...
Aaliyah - Try Again
Aaliyah - We Need A Resolution
Al Jarreau ft Phife Dawg - In My Music
Destiny's Child - Jumpin Jumpin
Destiny's Child - Survivor
Mary Mary - Shackles
Melky Sedeck - Raw
Missy Elliott - Get Your Freak On
Outkast - Ms Jackson
Panjabi MC - that one with the "Knight Rider" sample
Santana ft Wyclef & Project G&B - Maria Maria
Truth Hurts ft Rakim - Addictive
Wyclef & Mary J Blige - 911
shit most of those i can actually remember the names of are more "poppy" than most of what i tried to describe above... feel free to shhot them down if u want cos i haven't actually listened to them in a few years...