Wow, this is one of my favorite songs of ALL TIME. No matter where I’m at, what I’m doing, or what kinda mood I’m in, I can play this song over and over. “U Know What’s Up” is so smooth and has the kinda vibe you can just sit back and bob your head to. To date, this is Donell’s only #1 single on the r&b charts (“Where I Wanna Be” reached #2). R.I.P. Left Eye.