Matthew Kelly Sharp is an American songwriter and musician. Until 1998, he was the bassist for the rock band Weezer, which he co-founded in 1992. He appears on their first two albums, the Blue Album (1994) and Pinkerton (1996). In 1994, Sharp founded Rentals, who have released five albums. Sharp has also released an EP and an album as a solo artist.

Weezer is an American rock band formed in Los Angeles, California, in 1992. Since 2001, the band has consisted of Rivers Cuomo, Patrick Wilson, Brian Bell, and Scott Shriner. They have sold 10 million albums in the US and more than 35 million worldwide.