Rap and Hip Hop is all about attitude and expressing your message in the form of music, dance, expressions or art(graffiti)
It's all about precision tempo. If a rain drop's falling in a particular tempo, you can rhyme on it. Rap is all about rhymes and messages conveyed in an impulsive manner to potray strong feelings and emotions to the masses where the wordings connects to the brain and the beats captures the heart.
It's a religion where there is no discrimination, yet there is fight. There is no blood, but the battlefield is huge during war.