← Music🎵 Tube Length and PitchGrade 3 · Elementary
📖 Read this first — then you'll teach it
🖍️ Highlighted = the heart of it. Build your lesson from these — they're worth 60% on their own. Say them in your words to go past 80!

A recorder is a little tube you blow into to make music. It has holes down the front, and you cover them with your fingers to play different notes. But how does covering holes change the sound?

When you blow into a recorder, the air wiggles all the way down the tube. The amount of tube the air travels through decides how high or low the note sounds.

Covering more holes on a recorder makes the note lower, because the air gets a longer tube to travel through. When you lift your fingers off the bottom holes, the air can escape sooner, and the tube it uses is shorter.

Here is the big idea: longer tubes make lower sounds, and shorter tubes make higher sounds. That is why a giant tuba rumbles low and a tiny whistle squeaks high.

You can hear this rule almost everywhere, not just on a recorder. A long organ pipe booms deep, while a short one sings high and bright.

So the next time you cover the holes on a recorder, remember you are making the air travel a longer path. A longer path means a longer tube, and a longer tube means a lower, deeper sound.

🤖 Now your AI tutor asks — write your answer or your thinking:
No wrong answers here — jot what you think. You'll use these when you teach it in Step ②. (Saved automatically.)
🎵Why do you think covering more holes makes a lower sound?
📏How is a recorder like a long organ pipe?
🤔What would happen to the pitch if a recorder were made much longer?
🎶Where else have you heard long things make low sounds?
🌬️How does the air's path change when you lift your fingers off the holes?
🎺Why do you think a tiny whistle squeaks so high?
✅ Quick check — did it stick?
Get these right and the Teaching Hall opens. Wrong pick? You'll see why — then try again.
Covering more holes on a recorder makes the note...?
Longer tubes make sounds that are...?
Why does covering holes change the pitch?
3 more quick checks to go — get them right and you're in. 💪