I'm feeling sad.

How come?

It's, uh... well, um... Uh-oh, I can't remember what made me feel sad in the first place.

(sighs) Oh, does that mean I'm going to feel this way forever?

That makes me even sadder!

Don't worry.

I'm going to help you feel happy again.

You'll be feeling Peterrific in no time!

(sighs) ♪ ♪ (sighs) ♪ ♪ (sighs) Wow, you really are sad.

Let's ask Mommy and Daddy for help.

Oh, hi!

Do you want to see my newest invention?

It's called the compost cart.

It takes the compost bucket from the kitchen, and empties it in the bin on the side of the house.

I'm still working on it.

(sighs) What's wrong, Peter?

You look a little sad.

He's got a case of the (sighs three times), and nothing is cheering him up.

Yeah.

Oh, it sounds like you've got a case of the blues.

What's that?

That's when you feel really sad.

You know, I've got something that might help.

It's got to be here somewhere... (mumbling) Here it is!

A harmonica?

That's right.

(harmonica riffs) How is that going to help Peter stop feeling sad?

When you've got the blues, sometimes it helps to play the blues.

Play the blues?

It's a kind of music that helps you express your feelings when you're sad.