From the Phineas and Ferb original TV soundtrack
Lyrics:
Let's take a rocket ship to space
I hear it's a real swinging place
There isn't much air or gravity there
The stars will make your heart race
Let's take a rocket, let's take a rocket
Let's take a rocket ship to space
Let's take a saucer to the stars
Look out moon, move over Mars
The Martians all rock to Bassie and Bach
So bring your maracas and your jazz guitars
Let's take a saucer to the stars
Let's take a rocket, a crazy kind of rocket
Let's take a rocket ship to space
It's the final frontier, baby