Play music as children are entering at the start of class. Allow them to explore with an instrument not used in the rest of class.
The Carnival of the Animals (Le carnaval des animaux) is a humorous musical suite of fourteen movements by the French Romantic composer Camille Saint-Saëns. The work was written for private performance by an ad hoc ensemble of two pianos and other instruments, and lasts around 25 minutes. For more information see Wikipedia: https://en.wikipedia.org/wiki/The_Carnival_of_the_Animals