Rhythm Game: "Busted!" Pull a stick from the jar, clap its rhythm. Pull another stick, clap both rhythms. Continue cumulatively. If you pull the "busted" stick, you have to put all yours back. Kid with most at the end wins.
Music Truth or Dare Playing Cards. Organized Chaos. These are perfect for reviewing and practicing music skills and concepts in a fun way! Would work as a full class or center activity. Comes with a variety of concepts and skills to cover different grade levels, plus blank versions you can write or type on to make your own.
Sing or Dare: "Sing" cards like "sing [the song] while marching the beat" or "sing the song, but buzz all the words 'the'." "Dare" cards like "Name everyone in the room" or "Hug the teacher." (I think I might change the dares to musical things like "sightread a simple song" or "play the melody on the xylophone.")