The pinner said, "Charlie Over the Ocean" is a fun music circle game in the format of Duck-Duck-Goose, the leader walks around the circle singing the song while the group echos. Great way to hear individual voices without the pressure. "singing alone and with others" standard is covered here. This youtube channel has many classic folk-song elementary music games.
Movement Routine to Minute Waltz by Chopin. Could also use for movement exploration, high vs. low, melodic direction. Orff approach and let the students explore instead of giving them the movements. Lesson extension - or second or 3rd time with song, give more parameters to teach form as shown in video.
My 3-5's did this with tennis balls and K-2 with scarves. Whole notes with scarves were a full circle with one arm going overhead, and half notes were passing around the body. Quarter notes we passed the scarf from hand-to-hand in front, and for Eighths we waved the scarf up and down. Great activity!
Good beginning of the year activity to get to know students: "Jump in; jump out; turn yourself about. Jump in; jump out; introduce yourself." "My name is ____. (yeah) I love to ______. (yeah) And I'll be ___ing (yeah) for the rest of my life."