“You hear my voice, your hear that sound
Like thunder, gonna shake the ground”

Katy Perry – Roar Lyrics on LyricsMode
EXPLANATION
Katy is ready to speak up for herself loud and clear for everyone.
EXPLANATION
She make sure she come off as loud and clear, she will not back down from what she wanted. She gonna fight this battle till the end. She will knock them down and prove that they are wrong.
EXPLANATION
She is saying that she wont be ignored anymore, that she will be heard.