Question: Terry Butler is an American bassist who currently performs with the death metal bands Obituary and Massacre, and he was also a member of Six Feet Under, an American death metal band from Tampa, Florida, formed in which year?

Context paragraphs:
Inked in Blood: Inked in Blood is the ninth studio album by American death metal band Obituary.  It was crowdfunded via Kickstarter and then released on October 28th, 2014 through Gibtown Music/Relapse Records.  It is the first studio album with lead guitarist Kenny Andrews and bassist Terry Butler, making this the first Obituary album not to feature Frank Watkins on bass since 1989's "Slowly We Rot".  A deluxe edition of the album was also released containing two bonus tracks.  It is their first album to appear on the "Billboard" 200 chart, selling 5,200 copies in its first week and peaking at 79.

Obituary (band): Obituary is an American death metal band formed in October 1984 in Tampa, Florida.  Initially called Executioner, the band changed their name to Xecutioner in 1986 to avoid confusion with the thrash metal band Executioner from Boston, and then changed their name once again to Obituary in 1988.  The band's current lineup consists of vocalist John Tardy, lead guitarist Kenny Andrews, rhythm guitarist Trevor Peres, bassist Terry Butler, and drummer Donald Tardy.  Obituary has gone through several lineup changes, with Peres and the Tardy brothers being the only constant members.  The band was a fundamental act in the development of death metal music, and is one of the most successful death metal bands of all time.  To date, Obituary has released ten studio albums, and with the exception of their 1997–2003 split, they continue to perform live around the world.

Swedish death metal: Swedish death metal is a death metal music scene developed in Sweden.  Many Swedish death metal bands are associated with the melodic death metal movement, thus giving Swedish death metal a different sound from other variations of death metal.  Unlike American death metal groups, the first Swedish bands were rooted in punk rock.  Although Norway is known for its quantity of black metal, Gothenburg in Sweden has a large melodic death metal scene, while Stockholm is known for its more raw death metal scene.

Terry Butler: Terry Butler is an American bassist who currently performs with the death metal bands Obituary and Massacre.  He was also a member of Six Feet Under and Death.  He was credited on the Death album "Spiritual Healing", and band leader Chuck Schuldiner stated that on the latter Death album "Terry contributed to the songwriting as well".

Six Feet Under (band): Six Feet Under is an American death metal band from Tampa, Florida, formed in 1993.  The band consists of five members: founding vocalist Chris Barnes, guitarists Ray Suhy and Jack Owen, bassist Jeff Hughell and drummer Marco Pitruzzella.  It was originally a side project formed by Barnes with guitarist Allen West of Obituary, but became a full-time commitment after Barnes was dismissed from Cannibal Corpse in 1995.  They have released twelve albums, and are listed by Nielsen Soundscan as the fourth best-selling death metal act in the U.S., with album sales over 370,000 (sales numbers are taken from 2003).

Incantation (band): Incantation is an American death metal band that was formed by John McEntee and Paul Ledney in 1989.  They are one of the leaders in the New York City death metal scene along with fellow bands Suffocation, Mortician and Immolation, even though the band is currently located in Johnstown, Pennsylvania.  To date the band has released ten full-length records, two live records, four EPs, two singles, three splits, one DVD, and three demos.  Their most recent album "Profane Nexus" was released through Relapse Records in August 2017.  The band have maintained a significant cult following and underground popularity since the 90s, and are considered to be highly influential on a range of later death metal bands including Dead Congregation, Grave Miasma, and Portal, who are often described as 'cavernous death metal'.  Incantation's music frequently draws on anti-Christian, Satanic and occult themes, and the band is notable for mixing widely varied tempos into their music, often playing slow, down-tuned passages similar to those performed by death-doom bands like Autopsy.

Allen West (musician): Allen West (born October 17, 1967, Brandon, Florida) is an American death metal guitarist who has been a member of Massacre, Obituary, Six Feet Under, Lowbrow, and Southwicked.  He is considered to be a pioneering figure of the death metal genre in the 1980s.

Morbid Angel: Morbid Angel is an American death metal band based in Tampa, Florida formed in 1983 by guitarist and sole remaining original member Trey Azagthoth, original vocalist and bassist Dallas Ward, and original drummer Mike Browning.  Widely considered as one of the most influential bands in the genre and important in the transition of death metal from its thrash metal roots, they were one of the first bands to incorporate guttural vocals, up-tempo blast beats, atonality in guitar playing, multiple tempo changes and dark atmosphere.  They have been described as one of "the most influential and emulated bands in death metal", alongside Cannibal Corpse, and have been cited as an influence by many later bands.  They were also the first death metal band to experience mainstream success in connection with being signed to Giant Records in 1992, heavy rotation of their music videos on MTV, and having the music video for the song "God of Emptiness" shown on an episode of "Beavis and Butt-head".  Their first four albums are considered classics in the genre.

Steve Swanson: Steve Swanson, of Tampa, Florida, is the former lead guitarist for the death metal band Six Feet Under.  He took over guitar duties from Allen West (of Obituary), who left the band in late 1997.  Before Swanson joined in February 1998, he was in Massacre with Terry Butler on bass.

George Fisher (musician): George "Corpsegrinder" Fisher (born July 8, 1969) is an American extreme metal vocalist for the American death metal band Cannibal Corpse, the lesser-known melodic death metal band Paths of Possession, and the lesser-known extreme metal supergroup Serpentine Dominion.  He recorded two albums with Florida's Monstrosity before leaving and joining Cannibal Corpse in late 1995, replacing vocalist Chris Barnes, who is now the vocalist for Six Feet Under.  He also provided guest vocals for New York technical death metal band Suffocation on the songs "Reincremation" and "Mass Obliteration" from their debut album, "Effigy of the Forgotten", as well as guest vocals for California deathcore band Suicide Silence on the song "Control" from their fourth album, "You Can't Stop Me".  Fisher also performed guest vocals on Job for a Cowboy's 2014 album "Sun Eater" on the song "The Synthetic Sea."  As a death metal vocalist, Fisher employs the "death growl" extended vocal technique.

Supporting paragraphs: Terry Butler Six Feet Under (band)
Answer: 1993