It's a fusion of Classic/Alternative-Rock,
Funk Rock, Hip-Hop & Soul combined with
soulful overtones as well as melodic choruses. Music considered to soulful to be completely rock and to alternative rock to be R&B Hip-Hop.
The word was introduced by
Urban Rock Band The Rocturnals formerly known as KansasCali in early 2000 to describe their style of music.
The difference between rock music and
urban rock music is that
urban rock is a little more melodic &
bottom heavy.