It’s a hilarious moment full of secondhand embarrassment for the already socially-awkward birthday girl.

But it’s also the first time someone performs an original song onthe NBC musical drama.

“Austin was such a champion at this.

He came to us with the lyrics and the idea and how he wanted it to sound.

He really drove the creative vision for it.

He’s just a talented guy.

Austin tends to make me angry because he’s so good at too many things.”

ENTERTAINMENT WEEKLY: How long have you been planning to do an original song on the show?

With the original, you have a little bit more flexibility.

It was a different exercise than we’ve ever done on the show.

And the challenge was trying to make it sound like the scene.

This had to represent a garage band.

We had to make it sound cool but not too cool, good but not too good.

But I just feel like the tone of the show is so specific.

[Laughs] I should just quit TV and do songwriting full time.

Normally we’re looking at a pre-existing song.

Here’s how it used to sound.

Here’s how we want it to sound.

And then we just make it.

With the original one, we have a lot more flexibility, a lot more creativity.

There was a lot more to be worked out.

How does this song change things up moving forward?

And it’s kind of an inappropriate love song to his sister!

For him it was an opportunity.

It just might not have been the most appropriate way possible.

Are you going to be doing more original songs moving forward?

It’s all case-by-case basis.

There’s some very big moments and incredible vocal performances.

Zoey’s Extraordinary Playlistairs Sundays at 9 p.m. ET/PT on NBC.