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