When it doubt sing, dance and chant... here are two videos of kids singing along with Level 1 Unit 1 Song from the Our Discovery Island pilot.
Here's one with a girl leading and the teacher joining in as a student normally would:
L1_U1_Happy.B'day.Song.Girl.Leading from Mr.Jolly on Vimeo.
Here's one where the boy leading the class added a special action of his own: