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Starting the song is the hardest part. Try looking out past the audience. Find a spot in the back of the room. Concentrate on that spot and use it when you need to regroup. You can also close your eyes or imagine the audience is dressed up in silly outfits until you begin. Stand up straight. Open your mouth wide like a singer on TV would. Remember all you learned about how to sing. You want your body to stay expansive so you get plenty of air into your lungs. Make sure your voice resonates throughout your airways. Proper posture and breathing will make you sound better and also calm you down. When practicing the song, you should have developed an interest in it. Now it's your turn to present the song so others can understand it. Another source of passion is your love of singing. Put emotion into your words and show the audience why you are performing for them. Once you get to this point, getting through the song is no challenge at all. Mistakes happen even to experienced soloists. Sometimes you'll drop the mic, get feedback, or forget words. The best solution is to keep singing. Don't stop and wait for others to help you out. Instead, continue so you put the mistake in the past. By the end of your performance, the audience will have forgotten what went wrong.
Distract yourself until you begin singing. Open your mouth wide and breathe. Express your passion for the song. Keep going when you make a mistake.