The mashup between the theme songs of Jessie and Austin & Ally ("Hey Jessie" and "Can't Do It Without You") known as "Hey Jessie, Can't Do It Without You" is the theme and opening song for the crossover Austin & Jessie & Ally All Star New Year!. It is performed by Ross Lynch as Austin Moon and Debby Ryan as Jessie Prescott.
Oh oh oh oh,
oh oh, oh oh.
Hey Jessie! Hey Jessie!
When the crowd wants more,
I bring on the thunder
Cause you got my back
And I'm not going under
You're my point
You're my guard
You're the perfect chord
And I see our names together on every billboard
My whole world is changing, turning around.
They got me going crazy yeah they're shaking the ground.
But they took a chance on the new girl in town.
And I don't wanna let them down, down, down, down, down, down, down.
There's no way I can make it without ya.
Do it without you
Be here without ya.
It's no fun when you're doing it solo.
With you it's like whoa
Yeah and I know.
I-I-I-I own this dream
Cause I-I-I-I've got you with me
- This song is based off of two other Disney theme songs.
- This song puts a technical twist on the otherwise two pop songs.
- This song is the first mashup heard in the Austin & Ally universe as well as the Jessie universe.