All 21 Masks have been revealed!!

Gnome - "When You're Smiling" by Billie Holiday
Mustang - "Here I Go Again" by Whitesnake
Rock Lobster - "SOS" by ABBA
Night Owl - "Fernando" by ABBA
Polar Bear - "Rapture" by Blondie
Wolf - "Break On Through" by The Doors
Squirrel - "Try" by P!nk
Jackalope - "Whenever, Wherever" by Shakira
Axolotl - "Can't Fight the Moonlight" by LeAnn Rimes
Fairy - "You're No Good" by Linda Ronstadt
Moose - "Power of Love" by Huey Lewis & The News
Scorpio - "Girls Just Wanna Have Fun" by Cyndi Lauper
Doll - "Don't You (Forget About Me)" by Simple Minds
Dandelion - "Somewhere Over the Rainbow" by Judy Garland
Lamp - "Venus" by Bananarama
Mantis - "Old Time Rock 'n Roll" by Bob Seger
UFO - "Tears Dry on Their Own" by Amy Winehouse
California Roll - "Creep" by Radiohead
Macaw - "You Don't Know You're Beautiful" by One Direction
Medusa - "Welcome to the Black Parade" by My Chemical Romance