Team Umizoomi sang this song in Buster the Lost Dog. It explains how if you understand the signs then they'll help you know where to go, what to do, and just simply help you out.
(Italic is the speaking not singing.)
Lyrics
Team Umizoomi: Signs, signs, everywhere you go
You'll find signs that let you know
Where to go, what to do
Read the signs, and they'll help you
Geo: The light is green.
The light is red.
This way! Now that way!
Bumps ahead? Whoooa!
Team Umizoomi: Signs, signs, everywhere you go
You'll find signs that let you know
Where to go, what to do
Read the signs, and they'll help you
Milli: It's gonna be a sunny day
Now it's raining shoes?!
Lemonade, 5 Umicents.
Look out for kangaroos?!
Team Umizoomi: Signs, signs, everywhere you go
You'll find signs that let you know
Where to go, what to do
Read the signs, they'll help you
Bot: Stand on one foot. OK.
Now hop up and down.
Oh! Put a chicken on your head?!
Now dance all around?!
Whoo!
Milli: Signs
Bot: Signs
Geo: Signs
Bot: Signs
Milli: Signs
Team Umizoomi: Signs!