Matthew Tyler Musto, known professionally as Blackbear, is an American singer, songwriter, and record producer. He has collaborated with numerous musical artists such as Marc E. Bassy, Justin Bieber, G-Eazy, Mike Posner, Maejor Ali, Palisades, Machine Gun Kelly, Mod Sun, Rivers Cuomo, Childish Gambino, Billie Eilish, Pharrell Williams, Miley Cyrus, Linkin Park and Jacob Sartorius. He co-wrote Boyfriend by Justin Bieber, alongside Mike Posner, which debuted at number two on the Billboard Hot 100. He also produced the title track from G-Eazy's album These Things Happen, as well as featuring on the album. Musto is also a member of the alternative hip-hop and R'n'B duo Mansionz with Mike Posner.