Music is counted in beats. Put your hand over your heart. Count four beats. Notice how your heart beat is steady and even.
Tap on the hearts below at an average tempo (speed). Now try it again at a quicker tempo and then a slower tempo. Be sure to keep the beat steady.
Show your child how to keep a steady beat by clapping or using a simple instrument. I like to use a pair of rhythm sticks. I prefer to have one plain and one fluted, because you can do more with them as you progress in learning about music. See the link below to buy from Amazon. You can also simply use two wooden spoons. I also find it easier to have a set of rhythm sticks or spoons for myself. This allows you to play along with your child. Besides making the lesson more entertaining, it often helps your child to know exactly what they are supposed to do and can eliminate some anxiety about playing music by himself.
My favorite composer is Franz Joseph Haydn. His Symphony No. 101 in D Major, also known as "The Clock", is a wonderful piece to practice keeping a steady beat.
This is a cello. It is part of the string family of instruments. The cello in this movement of the symphony sounds like the "tick-tock" of a clock. Keep a steady beat with the cello.
Symphony No. 101 in D major "The Clock"
"Ah Music!" by Aliki is a wonderful book to supplement your child's understanding of just what do we mean by "music". It is much more than something to relieve boredom. I especially like to show children the particular pages on "music is sound" and "music is feeling". Our local library system has several copies of this book, so you can look there first if you desire. It is definitely a great book for your home library, too. (I have included my affiliate link for Amazon if you decide to purchase. It is definitely worth the price, in my opinion.) Either way, I highly recommend this book for you and your child.
If you are new to the Music Adventures Lessons, please click on the graphic below for an introduction and more information.