Task: Question Answering
Input (English): Passage: In 1975, the Jackson 5 left Motown. They signed with Epic Records, a subsidiary of CBS Records, and renamed themselves the Jacksons. Their younger brother Randy joined the band around this time; Jermaine stayed with Motown and pursued a solo career. The Jacksons continued to tour internationally, and released six more albums between 1976 and 1984. Michael, the group's main songwriter during this time, wrote songs such as "Shake Your Body (Down to the Ground)" (1979), "This Place Hotel" (1980), and "Can You Feel It" (1980).In 1978, Jackson moved to New York City to star as the Scarecrow in The Wiz, a musical directed by Sidney Lumet. It costarred Diana Ross, Nipsey Russell, and Ted Ross. The film was a box-office failure. Its score was arranged by Quincy Jones, who later produced three of Jackson's solo albums. During his time in New York, Jackson frequented the Studio 54 nightclub, where he heard early hip hop; this influenced his beatboxing on future tracks such as "Working Day and Night". In 1979, Jackson broke his nose during a dance routine. A rhinoplasty led to breathing difficulties that later affected his career. He was referred to Steven Hoefflin, who performed Jackson's subsequent operations.Jackson's fifth solo album, Off the Wall (1979) established him as a solo performer and helped him move from the bubblegum pop of his youth to more complex sounds. It produced four top 10 entries in the US: "Off the Wall", "She's Out of My Life", and the chart-topping singles "Don't Stop 'Til You Get Enough" and "Rock with You". The album reached number three on the US Billboard 200 and sold over 20 million copies worldwide. In 1980, Jackson won three American Music Awards for his solo work: Favorite Soul/R&B Album, Favorite Soul/R&B Male Artist, and Favorite Soul/R&B Single for "Don't Stop 'Til You Get Enough". He also won a Grammy Award for Best Male R&B Vocal Performance for 1979 with "Don't Stop 'Til You Get Enough". In 1981 Jackson was the American Music Awards winner for Favorite Soul/R&B Album and Favorite Soul/R&B Male Artist. Jackson felt Off the Wall should have made a bigger impact, and was determined to exceed expectations with his next release. In 1980, he secured the highest royalty rate in the music industry: 37 percent of wholesale album profit. 
Question: What was the last name of the group's main songwriter from 1976 to 1984?
Output (English): Jackson.