MCs, or Master of Ceremonies, have been around for a while. You can hear them on any type of music from hip-hop to rap to dance to garage to drum 'n' bass.
An MC helps to create a vibe and drum up an atmosphere on a record or at a live show.
Your lyrics - also called chat and chants - are your currency and are really important.
Other popular MCs include Lisa Mafia, Ms Dynamite, Harvey from So Solid, Alesha from Mis-teeq and Busta Rhymes.
MCs are likely to be spotted in anything bling bling or wearing hoods, trackies and trainers.
Top words to use if you're in this crew include blood (brother or mate) and wheel it (when you're playing a record and you want to rewind it).