- [Jake] I'm Jake.

- [Esther] I'm Esther.

- [Jake] I play music in a polka band.

- [Esther] I'm a soul and R&B singer and songwriter.

- [Jake] We love music so much.

- [Esther] And we wanna share that with you.

- [Jake & Esther] This is "In Tune."

(upbeat music) - Vibration.

(upbeat music) (whistle blows) - I've got a pretty cool job, and that's because my job is making music with four of my friends in a band.

We get to travel all over the place, and we love being on stage with people clapping and cheering and singing along.

Music is the spice of life.

- My mother got me into music.

She was the director of music at my church.

She's a singer, songwriter, composer, and she made me start taking piano lessons when I was about nine years old.

And today, I do music all over, singing everything from jazz to pop to rock to blues.

Music is so powerful.

- That's right.

It's safe to say that Esther and me both love music.

- But you cannot have music without first having sound.

How is sound created?

- We're gonna show you.

Hey, how are they doing that?

(gentle clarinet music) (upbeat drum music) (upbeat French horn music) (gentle guitar music) How are they doing that?

In order to understand sound, we must first become scientists.

What happens when somebody strums a banjo, strikes a drum or blows on a tuba?

- The answer is vibration.

When something like this cymbal that vibration creates sound.

- That's right, and sound waves carry the vibration from this cymbal (cymbal crashes) right to our ears.

- Now, that's what I call “sound science”.

- And let's see what some of our fellow scientists have to say on the matter.

- Hello, my name is Arthur, and when I bounce this ball, it vibrates and makes a sound.

(ball bounces) - I'm Juliana.

These are keys, and when I shake them, they vibrate and make a sound.

(keys jingle) - My name is Gilbert, and when I blow this whistle, it vibrates and makes a very loud sound, like this.

(whistle blows) (baby cries) - My name's Elaina.

This is a glass and a fork, and when I hit the glass with the fork, it vibrates and makes a sound.

(fork dings on glass) - You can be a sound scientist, too, and find sound waves in action at home, at school, when you're walking down the street.

Listen with your ears and look with your eyes.

- What is making sound in the world around you?

How is that sound being produced by vibration?

And how does that sound make you feel?

(scissors click) - Can you hear that?

Oh yeah.

Oh yeah.

(hammer bangs) (upbeat music) (wind blows) (upbeat music) Literally every single sound that your ears can hear is caused by vibration.

Esther, give us an example.

♪ Ah ♪ - That's your vocal chords vibrating to produce sound.

- As a musician, I love these sounds.

I love being in a band and using all these sounds to create music.

- Vibration creates sound.

Sound creates music.

And that means if we have vibration, if we have sound, we can create music.

(upbeat funky music) - Vibration.

♪ Boom ba doom ba doom boom ba doom ♪ ♪ Boom ba doom ba doom boom ba doom ♪ ♪ Hey ♪ ♪ Boom ba doom ba doom boom ba doom ♪ ♪ Boom ba doom ba doom boom ba doom ♪ ♪ Boom ba doom ba doom boom ba doom ♪ ♪ Boom ba doom ba doom boom ba doom ♪ ♪ Boom ba doom ba doom boom ba doom ♪ ♪ Yeah, yeah ♪ ♪ Boom ba doom ba doom boom ba doom ♪ - Vibration.

(door slams) (dog barks) - I'm Jake.

- And I'm Esther.

- We're sounding off for now.

- Thanks for joining us.

Now go make some music.

(camera beeps) (upbeat music) (upbeat music continues and fade