The best music feud of 2019? It's shaping up to be the one brewing between Justin Bieber and Tool frontman Maynard James Keenan. It started when Bieber posted lyrics from a 1996 Tool song to his Instagram. After discovering that The Beeb was a fan, Keenan responded by posting '#bummer'. Now, Justin's wife Hailey has joined the fray. Hailey responded to Keenan, calling his hashtag diss a "very childish and hurtful thing to do", adding "You must be unhappy with yourself that you want to make people feel small who express their admiration for you." So far, Keenan has offered no official response to Mrs. Bieber's defense. Are you Team Tool or Team Bieber? How much would you pay for a Tool/Bieber collaboration? How much would you pay to NOT hear a Tool/Bieber collaboration?