I'll explain...
Send something as your entry that completely sounds URBAN. This means: R&B/Hip-Hop/Rap infused beats or sounds.
Sure Eminem's Not Afraid might sound Urban, but most sure thing is you'll hear that on Pop radio as well, so that's not that Urban.
If you want some examples that are currently on Pop radio, look at: Kanye & Jay - N*ggas in Paris, or Tyga's Rack City.
If you're way too much of a Pop-minded member, think of something "gangstah".