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As the MC, you're the main attraction. You have to own the stage and get people excited about the show. The DJ's got to keep the beat moving and the hype-man is there to back you up, so the pressure's on.  Banter with the audience to get them invested. Cue the DJ to drop the beat and let people sing along once you've coached them on the chorus. If you want people to be into the music, you've got to be into it to. Move around, feel the beat, and look like you're excited to be on stage. If you stand stock-still at the mic stand and look like you're bored, people will look the same way in the crowd. If you're well prepared, you should feel confident in your abilities and in your music, so you can throw yourself into putting on the best possible show you can for the people. It's time to shine. Give them a performance they'll never forget.  Make sure you've got all your lyrics memorized and have practiced using the mic so you can be confident that all the technical aspects of the performance are going to go off without a hitch. It's hard to perform with confidence if you're trying to remember all the words. It's always important to do a mic check before performing. Part of the work of performance is being there before the show to make sure everything is set up and working as planned. Don't be a fake rock star and blow off the pre-show responsibilities. Be a professional. Always go on stage sober and well-rested. Save the partying for after the show. It'll be hard to get into your music if you're mush mouthed, too quiet, or muddy in the mix. Rap shouldn't sound like one of the adults from old Peanuts cartoons. Put your vocals up front and make sure it's loud enough to be heard from all corners of the room. If you have trouble keeping your voice up while you perform, practice reading magazines and books out loud to get your voice naturally into a louder register. It might annoy your roommates, but it'll be worth it to amp up your performance to where it needs to be. Both at your shows and online, be active about interacting with your growing fanbase. The MC will be the face of the crew, so you need to take the publicity side of the rap game seriously. Stay out after your gigs to meet people and sell any merch that you have, being friendly and available. Encourage people to come out to the gigs on social media and respond to people personally on Twitter and Facebook. Rappers, maybe more so than any other group of musicians, are known for taking control of their social media and working it to its fullest potential. You're just as likely to get signed to a record deal from a popular YouTube video as a successful mixtape.
Get people pumped up and moving. Be confident on stage. Be clear, articulate, and loud. Keep in contact with your fans.