Answer by taking a quote from the following article:

Weezer is an American rock band formed in Los Angeles in 1992, consisting of Rivers Cuomo (lead vocals, lead guitar), Patrick Wilson (drums), Brian Bell (rhythm guitar, backing vocals, keyboards), and Scott Shriner (bass, backing vocals). After signing to Geffen Records in 1993, Weezer released their debut self-titled album, also known as the "Blue Album", in 1994. Backed by successful music videos for the singles "Buddy Holly", "Undone - The Sweater Song" and "Say It Ain't So", the Blue Album became a quadruple-platinum success.

Vocalist and lead guitarist Rivers Cuomo, drummer Patrick Wilson, bassist Matt Sharp and guitarist Jason Cropper formed Weezer in 1992. The band had its first practice on February 14 of that year; their first gig was closing for Keanu Reeves' band Dogstar shortly after. Weezer signed with Geffen Records on June 25, 1993, and the group recorded its debut album with producer Ric Ocasek at Electric Lady Studios in New York City. During the recording, Cropper left the band and was replaced by guitarist Brian Bell.  Weezer (also referred to as the "Blue Album") was released in May 1994. Geffen originally did not wish to release a single, to see what sales could be generated by word-of-mouth alone. DJ Marco Collins of the Seattle radio station The End started playing "Undone - The Sweater Song", leading Geffen to release it as the first single. The music video was directed by Spike Jonze. Filmed in an unbroken take, it featured Weezer performing on a sound stage with little action, bar a pack of dogs swarming the set. The video became an instant hit on MTV.  Jonze also directed the band's second video, "Buddy Holly", splicing footage from the 1970s television sitcom Happy Days with Weezer performing in a remade "Arnold's Drive-In." The video achieved heavy rotation on MTV and went on to win four MTV Video Music Awards, including Breakthrough Video and Best Alternative Music Video, and two Billboard Music Video Awards. The video was also featured on the companion CD for the Microsoft Windows 95 computer operating system. A third single, "Say It Ain't So", followed. Weezer is certified quadruple platinum in the United States, making it Weezer's best-selling album. It is certified triple platinum in Canada.

When did the band Weezer originally form?
Vocalist and lead guitarist Rivers Cuomo, drummer Patrick Wilson, bassist Matt Sharp and guitarist Jason Cropper formed Weezer in 1992.