Plus, Kylie Jenner stars in Tyga's new music video, Adam Lambert covers Janet Jackson and more!
■ Demi Lovato performed "The Star Spangled Banner" before Game 4 of the World Series, and crushed it!
■ Kylie Jenner joins boyfriend Tyga in his new zombie-filled music video for "Dope'd Up":
■ Martin Garrix shared his new song "Poison" for free:
■ Adam Lambert covered Janet Jackson's "Black Cat" on Halloween at Hilton@PLAY:
■ DNCE cover Adele's "Hello" decked out in Halloween costumes:
■ Jess Glynne premiered her new music video for "Take Me Home":
■ And finally, Justin Bieber shares a couple's creative "Sorry" Halloween video: