Matthew Kelly Sharp (born September 22, 1969) is an American songwriter and musician. Until 1998, he was the bassist for the alternative rock band Weezer, which he cofounded in 1992. He appears on their first two albums, the Blue Album (1994) and Pinkerton (1996). In 1994, Sharp founded the Rentals, who have released four albums. Sharp has also released an EP and an album as a solo artist.