Simple Three part Rhythm

This is a rhythm simple enough for 5th or 6th grade.   Ensemble skills and keeping a beat.  Part C is the simplest of rhythms,  kids think their singing a song for QUEEN.   
They love it, and even the least enthusiastic student will gladly perform part C.
Video explanation is further down the page, as well as an optional 4th part, and a video of my 6th grade class performing it.

Here is the optional 4th part, when you want to come back to this rhythm later in the year and add a new element.