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Decide the context of the event. Figure out the strengths and weaknesses of your voice. Practice singing the song alone. Practice with others.
Are you singing to your ten-year-old daughter at a birthday party with a few other friends? You'll probably want to keep it simple. Are you singing alone to your husband or wife? Maybe you should sing more softly and romantically. Are you singing with a huge group to your father at his 80th birthday party? Maybe you guys should all practice, or at least decide when you are going to sing. It’s important to understand the context of your event so you can figure out what’s appropriate. If you’ve got a deep voice, don’t try singing Happy Birthday in the traditional singsong way. Use your deep voice! Stay within your range and don’t try to hit the high notes. No one is expecting you to be an expert. Practicing often to yourself, for example at home, will allow you to work out any kinks that may be in your voice and also help you to remember the song. It will also allow you to add special flourishes to the song, like a “cha cha cha” after every line. If you’re performing with a group of other people it’s always a good idea to rehearse. Designate one person to act as the conductor and start on their cue. You don’t want to start at different times or end at different times. Otherwise, everyone should easily fall into line. If you’re singing with a group and you aren’t going to have time to practice before hand, don’t try doing anything special. It’s assumed that everyone knows the song.