In the 1970s and 1980s, the term MC (short for Master of Ceremonies, and sometimes misrendered emcee) was generally associated with what is now called rapping in hip hop music. MC has also sometimes been reported to stand for Microphone Controller, but this appears to be a backronym. This uncertainty over the letters' expansion may however be evidence to the ubiquitousness of the acronym: the full Master of Ceremonies is very rarely (if ever) used in the rap scene.
Rap music is one of the elements of hip hop; it is a form of rhyming lyrics spoken rhythmically over musical instruments, with a musical backdrop of sampling, scratching and mixing by DJs. Originally rapping was called MCing and was seen as supporting the DJ.
In the mid-1980s, rap became increasingly politicised, through the works of Public Enemy and others, and tended to chronicle the black urban experience. Gangsta rap may be seen in this context of subversion, but is also seen by some as the abandonment of a constructive message.(Source: Wikipedia)
Famous Hip Hop MCs include: