Question: The Jackson 5, a popular American family music group formed in 1964 but in which year did the younger band member Michael Jackson pursue a solo career while still part of the group?

 Formed in 1964 under the name the Jackson Brothers, the founding members were elder brothers Jackie, Tito and Jermaine.  Younger brothers Marlon and Michael would join soon after.  They participated in talent shows and performed in clubs on the Chitlin' Circuit.  They entered the professional music scene in 1967.  Signing with Steeltown Records and releasing two singles with the Steeltown label. The Jackson 5, or Jackson Five, currently known as The Jacksons, is a popular American family music group.  In 1969, the group left Steeltown Records and signed with Motown. <SEP>  Jackson has been called the King of Music Videos. American entertainer Michael Jackson (1958–2009) debuted on the professional music scene at age five as a member of The Jackson 5 and began a solo career in 1971 while still part of the group.  Steve Huey of AllMusic observed how Jackson transformed the music video into an art form and a promotional tool through complex story lines, dance routines, special effects and famous cameo appearances, simultaneously breaking down racial barriers.  Before "Thriller", Jackson struggled to receive coverage on MTV, allegedly because he was African American.  Pressure from CBS Records persuaded MTV to start showing "Billie Jean" and later "Beat It", leading to a lengthy partnership with Jackson, also helping other black music artists gain recognition.  MTV employees deny any racism in their coverage, or pressure to change their stance.  MTV maintains that they played rock music, regardless of race.  The popularity of his videos on MTV helped to put the relatively young channel "on the map"; MTV's focus shifted in favor of pop and R&B.  His performance on "Motown 25: Yesterday, Today, Forever" changed the scope of live stage show; "That Jackson lip-synced 'Billie Jean' is, in itself, not extraordinary, but the fact that it did not change the impact of the performance is extraordinary; whether the performance was live or lip-synced made no difference to the audience" thus creating an era in which artists re-create the spectacle of music video imagery on stage.  Short films like "Thriller" largely remained unique to Jackson, while the group dance sequence in "Beat It" has frequently been imitated.  The choreography in "Thriller" has become a part of global pop culture, replicated everywhere from Indian films to prisons in the Philippines.  The "Thriller" short film marked an increase in scale for music videos, and has been named the most successful music video ever by the "Guinness World Records". <SEP> The band member history of American R&B and pop group The Jackson 5 shows how the band has comprised different members of the Jackson family at various times during its chronology, with differing names as The Jackson Brothers (1964–1965), The Jackson 5 (1965–1975, with Motown) and The Jacksons (1975–1989, with CBS). <SEP> The Jackson 5 was an American music group, formed in 1963 by the Jackson family brothers Jackie, Jermaine, Marlon, Michael and Tito.  The quintet's first singles were recorded at Steeltown Records, a local label in their hometown of Gary, Indiana.  Songs recorded at Steeltown included "You've Changed", "We Don't Have To Be Over 21 (to Fall in Love)" and "Big Boy".  According to music journalist Nelson George, Michael Jackson and The Jackson 5's "real" recording history did not begin until their move to Motown Records in 1968.  The then Detroit-based company, led by Berry Gordy, housed established recording artists such as Stevie Wonder, Marvin Gaye and Diana Ross, as well as a producing-writing team known as "The Corporation".  Jackson 5 hit singles such as "I Want You Back", "ABC" and "The Love You Save" were written by the Motown team, and aided the five brothers in becoming the first black teen idols.