Dance Moves
Start the game by having the kids write down random words on slips of papers. Put the papers into a bowl and gather everyone into a standing circle. Pass the bowl around and have everyone pull out a slip of paper. After they've read their paper, turn on some music and pick one child to start the game. She'll come up with a dance move using the word on her paper. For example, if she has the word "kangaroo," she can use hopping as her dance move. Once she performs the move for about 10 seconds, the person to her left comes up with a dance move. This continues around the circle as everyone creates their own moves. Once everyone has contributed, have the kids vote on the best dance move.
Guess the Instrument
Before the party, create a CD full of sounds from instruments such as violins, guitars, pianos, and drums. Gather the kids around the stereo and play the CD, stopping after the players hear every new sound from a musical instrument. Ask the kids to guess which instrument made the sound. The first player to guess correctly wins a point. After you've gone through all of the sounds on the CD, total up the points for each player. The one with the most points wins the game.
Dancing Body Parts
Gather the kids into a circle and stand somewhere they can see you. After you put on some music, tell them they can only move the body parts you instruct them to move as they dance to the music. For example, start by only moving your pinkie finger, keeping the rest of your body motionless. Invite the kids to mimic your movements; anyone who doesn't is eliminated from the game. Make the movements more difficult as you go on, for example, only move your stomach muscles, or combine two movements, such as shrugging your shoulders while you tap your feet. The game ends when only one player--the winner--remains in the game.