input: In the 1970s Corea started working with vibraphonist Gary Burton, with whom he recorded several duet albums for ECM, including 1972's Crystal Silence. They reunited in 2006 for a concert tour. A new record called The New Crystal Silence was issued in 2008 and won a Grammy Award in 2009. The package includes a disc of duets and another disc with the Sydney Symphony Orchestra.  Toward the end of the 1970s, Corea embarked on a series of concerts and two albums with Hancock. These concerts were presented in elegant settings with both pianists dressed formally and performing on Yamaha concert grand pianos. The two traded playing each other's compositions, as well as pieces by other composers such as Bela Bartok. In 1982, Corea performed The Meeting, a live duet with the classical pianist Friedrich Gulda.  In December 2007 Corea recorded a duet album, The Enchantment, with banjoist Bela Fleck. Fleck and Corea toured extensively for the album in 2007. Fleck was nominated in the Best Instrumental Composition category at the 49th Grammy Awards for the track "Spectacle".  In 2008 Corea collaborated with Japanese pianist Hiromi Uehara on the live album Duet (Chick Corea and Hiromi). The duo played a concert at Tokyo's Budokan arena on April 30.  In 2015 Corea reprised the duet concert series with Hancock, again sticking to a dueling-piano format, though both also had synthesizers at their station. The first concert in this series was played at the Paramount Theatre in Seattle, and featured improvised music along with iconic songs from each of the duo and standards from other composers.

Answer this question "What albums did he work with Hancock?"
output: 

Problem: Background: Morbid Angel is an American death metal band based in Tampa, Florida formed in 1983 by guitarist and sole remaining original member Trey Azagthoth, vocalist and bassist Dallas Ward, and 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, multiple tempo changes and dark atmosphere. They have been described as one of "the most influential and emulated bands in death metal", alongside Obituary and 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.
Context: Morbid Angel was formed in 1983 in Tampa, Florida by guitarist Trey Azagthoth and drummer/vocalist Mike Browning. The band made their debut in 1987 on the New Renaissance Records record label. They recorded their debut album, Abominations of Desolation, in 1986, but the band was unsatisfied with the final product and it remained unreleased until 1991, printing 10,000 copies. In the early stages of their career the band developed a reputation for "gruesome stage antics."  In 1986, David Vincent joined the band, replacing Michael Manson and Sterling von Scarborough as vocalist and bassist respectively. Fellow Terrorizer drummer Pete Sandoval soon followed. Their first studio album, Altars of Madness, was released in 1989, and is regarded by many as one of the most important death metal albums of all time. It is also considered the first true death metal album. Music journalist Jason Birchmeier writes that:  Few albums struck a chord within the ears and minds of the late-'80s underground metal scene like Morbid Angel's Altars of Madness did at the end of the decade, setting a new precedent for metal bands to reach. With the arguable exception of Chuck Schuldiner's Death, never before had a heavy metal band carried their lightning-fast guitar riffs and equally spellbinding guitar solos into such horrific territory. Venom and Slayer redefined the extent to which a metal band could align itself with all things evil during the beginning of the decade, but Morbid Angel made these two groups sound like children's music compared to the Florida-based group's assaulting death metal sounds and their blasphemous lyrics.
Question: How many copies of their first album did they sell?
Answer: printing 10,000 copies.

Question: John William Heisman (October 23, 1869 - October 3, 1936) was a player and coach of American football, baseball, and basketball, as well as a sportswriter and actor. He served as the head football coach at Oberlin College, Buchtel College (now known as the University of Akron), Auburn University, Clemson University, Georgia Tech, the University of Pennsylvania, Washington & Jefferson College, and Rice University, compiling a career college football record of 186-70-18. In 1917, Heisman's Georgia Tech Golden Tornado were recognized as the national champion. Heisman was also the head basketball coach at Georgia Tech, tallying a mark of 9-14, and the head baseball coach at Buchtel, Clemson, and Georgia Tech, amassing a career college baseball record of 199-108-7.

Heisman was inducted into the College Football Hall of Fame as a coach in 1954, a member of the second class of inductees. Heisman was an innovator and "master strategist". He developed one of the first shifts. He was a proponent of the legalization of the forward pass. He had both his guards pull to lead an end run and had his center snap the ball. He invented the hidden ball play, and originated the "hike" or "hep" shouted by the quarterback to start each play. He led the effort to cut the game from halves to quarters. He is credited with the idea of listing downs and yardage on the scoreboard, and of putting his quarterback at safety on defense.  On December 10, 1936, just two months after Heisman's death on October 3, the Downtown Athletic Club trophy was renamed the Heisman Memorial Trophy, and is now given to the player voted as the season's most outstanding collegiate football player. Voters for this award consist primarily of media representatives, who are allocated by regions across the country in order to filter out possible regional bias, and former recipients. Following the bankruptcy of the Downtown Athletic Club in 2002, the award is now given out by the Heisman Trust.  Heisman Street on Clemson's campus is named in his honor. Heisman Drive, located directly south of Jordan-Hare Stadium on the Auburn University campus, is named in his honor as well. A bust of him is also in Jordan-Hare Stadium. A wooden statue of Heisman was placed at the Rhinelander-Oneida County Airport. A bronze statue of him was placed on Akron's campus. Heisman has also been the subject of a musical.

Using a quote from the above article, answer the following question: What was the shift he developed called?
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Answer: