A twist on the popular holiday song, this spooky rhyming board book gives O, Christmas Tree some Halloween flair! O Halloween Tree, O Halloween Tree. How crooked are thy branches. Have you ever seen a tree glow green with spooky cheer or ornaments that just might bite? Enjoy a boo-tiful holiday mash-up as ghosts, vampires, witches, and more find their perfect tree and decorate it for a night of celebration!