Bobby McFerrin is the singer who made Don’t Worry, be Happy famous. Here is a video that Mr. McFerrin "demonstrated the power of the pentatonic scale." Please watch the video.
Explore the C pentatonic scale (notes C, D, E, G, and A) on bells, boomwhackers, or xylophones.
Janice, I will make a video here
Katherine, I can add a note that teachers can use this software to create harmony: https://musiclab.chromeexperiments.com/ I have no idea what this is, you want to write something about this? Personally, I think students should use real instruments. But, just my two cents.
Let's watch another clip of the Sound of Music. Can you recognize when Maria and the siblings sing in harmony? Note that harmony is formed by singers singing two different melodies simultaneously. (Answer: when the kids are on the bikes, some hold a solfege note while others sing the melody. When they are in the carriage, the kids sing their melody using solfege, and Maria sings using lyrics/words. At the end of the stairs, they sing in harmony with different melodies using solfege.)