Soundgarden is an American rock band formed in Seattle, Washington, in 1984 by singer and rhythm guitarist Chris Cornell, lead guitarist Kim Thayil, and bassist Hiro Yamamoto. Matt Cameron became the band's full-time drummer in 1986, while bassist Ben Shepherd became a permanent replacement for Yamamoto in 1990. The band dissolved in 1997 and re-formed in 2010. Cornell remained in Soundgarden until his death in May 2017, putting the band's future in doubt and leaving Thayil as the only remaining original member of the band.

Though major labels were courting the band, in 1988 they signed to the independent label SST Records for their debut album, Ultramega OK, released on October 31, 1988. Cornell said the band "made a huge mistake with Ultramega OK" because they used a producer suggested by SST who "didn't know what was happening in Seattle". According to Steve Huey of AllMusic, Soundgarden demonstrates, a "Stooges/MC5-meets-Zeppelin/Sabbath sound" on the album. Mark Miremont directed the band's first music video for "Flower," which aired regularly on MTV's 120 Minutes. Soundgarden supported Ultramega OK on a tour in the United States in the spring of 1989, and a tour in Europe, which began in May 1989--the band's first overseas tour. Ultramega OK earned the band a Grammy Award nomination for Best Metal Performance in 1990. After touring in support of Ultramega OK the band signed with A&M Records, which caused a rift between Soundgarden and its traditional audience. Thayil said, "In the beginning, our fans came from the punk rock crowd. They abandoned us when they thought we sold out the punk tenets, getting on a major label and touring with Guns N' Roses. There were fashion issues and social issues, and people thought we no longer belonged to their scene, to their particular sub-culture." The band later began work on its first album for a major label, but personnel difficulties caused a shift in the band's songwriting process, according to Cornell: "At the time Hiro [Yamamoto] excommunicated himself from the band and there wasn't a free-flowing system as far as music went, so I ended up writing a lot of it." On September 5, 1989, the band released its second album, Louder Than Love, which saw it take "a step toward the metal mainstream," according to Steve Huey of Allmusic, describing it as "a slow, grinding, detuned mountain of Sabbath/Zeppelin riffs and Chris Cornell wailing". Because of some of the lyrics, most notably on "Hands All Over" and "Big Dumb Sex", the band faced various retail and distribution problems upon the album's release. Louder Than Love became the band's first album to chart on the Billboard 200, peaking at number 108 on the chart in 1990. A month before touring for Louder Than Love was to begin, bassist Hiro Yamamoto, who was becoming frustrated that he was not making much of a contribution, left the band to return to college. Jason Everman, formerly of Nirvana, replaced him on bass. The band toured North America from December 1989 to March 1990, opening for Voivod, who were supporting their album Nothingface, with Faith No More and the Big F also serving as opening acts at the beginning and end of the tour. The band then went on to tour Europe. The band fired Everman in mid-1990 immediately after completing its promotional tour for Louder Than Love. Thayil said that "Jason just didn't work out." Louder Than Love spawned the EP Loudest Love and the video compilation Louder Than Live, both released in 1990.Answer this question using a quote from the following article:

What was their major debut album?
Louder Than Love,