Question: Which alternative rock band was founded first, Galaxie 500 or Sponge?

Context articles: Sponge (band)
Magic Hour (band)
Galaxie 500
Luna (1990s American band)
Lunapark (album)
Galaxie (band)
The Portable Galaxie 500
On Fire (Galaxie 500 album)
Hudson Bell
Dean Wareham

Sponge is an American alternative rock band from Detroit, Michigan formed in 1991 by Vinnie Dombroski, Mike Cross, Tim Cross, and Joey Mazzola.
 All were formerly of the hard rock band Loudhouse.
 Sponge was signed to Sony Records in 1994 but has since switched to other labels.
Magic Hour were an American psychedelic rock band from greater Boston, Massachusetts, USA and were made up of former Crystalized Movements member Wayne Rogers and Kate Biggar and former Galaxie 500 members Damon Krukowski and Naomi Yang.
Galaxie 500 was an American alternative rock band that formed in 1987 and split up in 1991 after releasing three albums.
Luna are an American dream pop/indie pop band formed in 1991 by singer/guitarist Dean Wareham after the breakup of Galaxie 500.
 Described by "Rolling Stone" as “the best band you’ve never heard of”, Luna combined intricate guitar work, traditional rock rhythms and poetic lyrics.
Lunapark was the debut album by indie rock band Luna.
 It was released in 1992 on Elektra Records.
 As the first musical outing of Dean Wareham since the disbanding of Galaxie 500, "Lunapark" set forth the new musical directions of Wareham and embraced a musical sound that would continue to evolve throughout Luna's tenure.
 Originally recorded as a three-piece, Luna did not add guitarist Sean Eden to the lineup until 1993's "Slide" EP.
Galaxie is a francophone indie garage rock band formed in 2002 in Montreal, Quebec, Canada.
 Formerly known as Galaxie 500, they should not be confused with the American alternative rock band Galaxie 500.
The Portable Galaxie 500 is a greatest hits studio album by the rock band Galaxie 500.
 It was released in 1998 on Rykodisc.
On Fire is the second studio album by American alternative rock band Galaxie 500, released in 1989 on Rough Trade Records.
 It was recorded at Noise NY in New York City with Mark Kramer handling production duties.
 The "Rolling Stone Album Guide" called it Galaxie 500's "best album by far".
Hudson Bell is an American indie rock band from San Francisco.
 The group is named for lead member Hudson Bell himself, who is the guitar player, vocalist, and songwriter.
 Attributes that remind reviewers of the Idaho-based indie rock band Built to Spill include long songs that emphasize detailed guitar work, pensive lyrics, unhurried vocal style, and a voice that sometimes closely recalls Built to Spill's Doug Martsch.
 Pandora Radio lists Galaxie 500, Black Cab, Pavement, and Superchunk as similar artists.
Dean Wareham (born 1 August 1963) is an American musician and actor who formed the band Galaxie 500 in 1987.
 He left Galaxie 500 in April 1991 and founded the band Luna.
 Since Luna's breakup in 2005, Wareham has released albums with fellow Luna bandmate (and wife) Britta Phillips (see Dean and Britta).
 He also works as a film composer, notably on the Noah Baumbach film "The Squid and the Whale".
 He released a self-titled album in 2014 and reformed Luna in 2015.