Posted by Errant_Harpy in the G5 MLP Wiki's Discord server.

This is "Glowin' Up", the song that the Musical Star Princess Petals toy plays. According to BMI, it was written by Jenna Andrews (confirmation on Twitter), Bryan G. Fryzel and Taylor Cameron Upsahl.

Transcription attempt
I know that I am a fighter
I feel the fire
I'm shining brighter! (oo-oo-oo-oo)

Everywhere that I've been
Yeah, they say I'm different
But I wouldn't mask it (oo-hu-hoo-oo)

Won't wait any longer
We'll get in it together
If you wanna [fit in?]
You can paint the sky

Woo-hoo-ohohohoooho
We've got that boom boom [bada?] boom

Look [inaudible]
We say hi, you say what