Summarize this article in one sentence.
Other people will want a chance to sing, so sit back and appreciate their performances instead of being rude. Listen to the performances and clap when one ends. Don't crowd around the DJ asking for your turn and don't interrupt someone else's performance. Be kind to the DJ and their equipment. Often running karaoke is work for them and they deal with many people who may be drunk, rude, or requesting the same song. When you request a song, give them a little bit of money. For special requests, such as bringing all your friends on stage to sing one song, give them an extra tip. If you need to politely ask the DJ a question, do it during a performance. When there's no singing, the DJ is usually busy setting up for the next song. So it's your turn at last. Now you have to go on stage with all the eyes in the room upon you. Breathe in. Breathe deeply and try to take in more air as you perform. This will help you relax and sing louder. Get into your performance. Don't be afraid to move around and project your voice. Have fun and you'll find that your performance benefits too. Karaoke isn't about having the best voice in the room. Stay present and stay excited at being the focus of the attention for a few minutes. When your turn is done, go back to your seat. Don't try to perform another song. Also, move away from the stage. Crowding other performers, dancing in front of the stage, or jeering is bad etiquette.

Summary:
Wait patiently. Respect the DJ. Sing with confidence. Sit down when your song ends.