So being that most instrument versions were very short this early DJ started using a mixer to make the insturmental versions longer. The mixer would allow for the instrumental part to be played over and over again. At some parties in the early 70's many people thought that an actual song did last for 15 minutes. But all the while it was the DJ mixing it to make it last that long. The reason why this type of music is so popular today is because it offer urban youth a chance to freely express how they feel.
Most rhymes are prewritten, but it is a sin to recite the rhymes off of paper.
This is where the orginal concept comes in. Many times what was written on paper is forgetten at concerts and the rapper just starts rapping off the top of his or her head. Hip hop takes on on many forms, cutting and scratching a record, break dancing, graffiti art, double dutch dancing. During the late 90's hip hop took on a new level. Hip Hop went mainstream in term of fashions.