Riverbreeze made a post for it so I shall share mine!

Winterfrost(thats her name right? Haven't used her in awhile) would be Human by Christina Perri

Hollyflame would be Unstoppable by Sia

Rainshine would be Just Like Fire by P!nk

Dawnfeather would be Stronger by Kelly Clarkson

Dragonlily would be War by Young Yeller

Snowflight would be Counting Stars by OneRepublic

Iceglade would be Feel Invincible by Skillet

Thornflower would be The Phoenix by Fall Out Boy

Hazeltwist would be Unstoppable by The Score

(I might add more later!)