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Pick outfits that help you stand out. Enjoy yourself while you're playing. Get out from behind the mike when you can. Make eye contact with people in the audience. Engage with the audience. Act confident to feel confident. Exaggerate your movements so people in the back can see you.
When you're on stage, you shouldn't be wearing what you would to go to the grocery store. It should feel put-together in some way. That doesn't mean you need to wear a coat and tie! However, it should tell the audience a little bit about who you are even before you start playing. For example, for a heavy metal band, you might opt for leather and metal, while for a rock and roll band, maybe you want torn jeans and metallic t-shirt. Go a little crazy. You're allowed to pick out something you wouldn't normally wear to help you stand out. If you're not having a good time, the audience is going to notice. You have to be engaged with the music and act like it's totally consuming you. Make sure you're moving the whole time you're on stage, whether it's just bouncing your head or moving your whole body to the beat. You can fake this if you're not feeling it. Just act like the music is really making you want to move to the beat! If you're not singing, walk away from the mike. It separates you from the audience, so when you can, you want to go to the side or in front of it. It will help you engage your audience better. You can also engage with the lead singer and other members of the band as you move around. However, be mindful of your cord! You don't want to get it wrapped around the mike or get tangled up in it. An even better solution is to go wireless if you can. Similarly, if you don't need the guitar for part of the show, slip it behind you so it's not between you and the crowd while you sing. Don't just stare down at your guitar the whole time you're playing. You know those riffs by now! Look out into the crowd and connect with people by looking them in the eye. The more you engage, the more people will enjoy your show. If you don't have your chords or riffs memorized, work on getting them down so you can just groove while you're on stage. Engagement is key to getting the crowd into your music and making them feel like they're part of the show. Nod or smile at people who are trying to make eye contact, for instance, or go and high five those people who are holding their hands up at the front. You could even bring 1-2 people up on stage to dance with you. Engaging with people makes it personal, and they're more likely to invest in you in the future! If you're hunkered over your guitar near the back of the band staring at the strings, that doesn't exude confidence. Stand up, push your chest out, and get to the front of the stage. Show the crowd you know what you're doing and you're ready to play! It's also good to take a wide stance. When you're feet are together, it makes you look smaller and less confident. When you're performing in front of a live audience, particularly a large one, you have to make your movements large. That way, even the people in the far back can see them, and they will look intentional instead of accidental. For instance, if you're strumming extra hard, move your hand farther up and down than you normally would.