I am a single father, and we really only have two rules in our house. 1/ Don't be a d..k, and 2/ No Justin Bieber. I knew my daughter had hit her rebellious stage when she showed me a Bieber song on Spotify, perched incongruously between Iggy Pop and the Velvet Underground.
Of course, she couldn't bring herself to listen to it. Everyone knows Bieber is a gateway musician to Timberlake, and things just get messy after that. Lives can be ruined.