Please answer the following question: Information: - Michael Edward '' Mikey '' Welsh ( April 20 , 1971 -- October 8 , 2011 ) was an American artist and musician , best known as the former bassist of Weezer . He played with Weezer frontman Rivers Cuomo during Cuomo 's time in Boston during the hiatus in the band Homie . Following original bassist Matt Sharp 's decision to leave Weezer to focus on his group , The Rentals , Welsh was chosen to take over on bass . Welsh played with Weezer from the time that they regrouped in 2000 until August 2001 , when he suffered a mental breakdown . Shortly afterwards , he retired from music to focus on his art career . Welsh died on October 8 , 2011 . - Weezer is an American rock band formed in Los Angeles in 1992, consisting of Rivers Cuomo (lead vocals, guitar), Patrick Wilson (drums), Brian Bell (guitar, backing vocals, keyboards), and Scott Shriner (bass guitar, backing vocals). Weezer has sold 9.2 million albums in the US and over 17 million worldwide. - The Rentals are an American rock band fronted by vocalist Matt Sharp, best known as the former bassist for Weezer. Sharp has been the only consistent member since the group's inception. The band is best known for their 1995 single "Friends of P." The Rentals released two albums, "Return of the Rentals" (1995) and "Seven More Minutes" (1999) on Maverick Records before quietly splitting in 1999 following a world tour. The group reformed in 2005 and have since released several EPs and a third full-length album, "Lost in Alphaville", which was released August 26, 2014 on Polyvinyl Records. Due to the revolving nature of studio and live collaborators, determining who is actually an official member of the group at any one point is difficult. - Return of the Rentals is the debut album by alternative rock band The Rentals, released on October 24, 1995, through Maverick Records, a subsidiary of Reprise Records. The album features Matt SharpWeezer's bassist at the timeon vocals and bass, as well as Weezer drummer Patrick Wilson. Other contributors include Tom Grimley (Moog, production), Petra Haden (violin, vocals), Rachel Haden (vocals), Guy Oseary (album artwork), and Stephen Marcussen (mastering). - Scott Gregory Shriner (born July 11, 1965) is an American guitarist and singer-songwriter. He is best known as a member of the rock band Weezer, with whom he has recorded seven studio albums. Joining the band in 2001, Shriner is the band's longest serving bass guitarist. What is the relationship between 'mikey welsh' and 'bass guitar'?
A:
instrument