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?

Context articles: Michael Jackson videography
Diana!
Love Songs (Michael Jackson album)
The Very Best of The Jacksons
List of songs recorded by The Jackson 5
Jackson 5: The Ultimate Collection
List of The Jackson 5 band members
Jackson family
The Jackson 5
The Stripped Mixes

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.
 Jackson has been called the King of Music Videos.
 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".
Diana!
 is the first solo television special of American singer Diana Ross and aired on ABC on April 18, 1971.
 The special was choreographed by David Winters of "West Side Story" fame, who at that time choreographed all of Ross' stage and television shows.
 The special featured performances by The Jackson 5, and also included Jackson 5 lead singer Michael Jackson's solo debut.
 Michael Jackson performed Frank Sinatra's "It Was a Very Good Year", which drew laughter as its adult-themed lyrics were changed to fit his age.
 Other guests included Danny Thomas and Bill Cosby, who would be featured on a similar television special by the Jackson 5 ("Goin' Back to Indiana") a few months later.
Love Songs is a compilation album by American recording artist Michael Jackson.
 It was released on January 15, 2002 by Motown Records as a part of "Motown's Love Songs" line.
 The album contains 14 love songs and ballads Michael Jackson recorded, either by himself or with The Jackson 5, during his time on Motown in the early '70s.
 In this case there are many hits of Michael (such as "Got to Be There"), or The Jackson 5 hits, such as "Who's Lovin' You,".
 It also includes an unreleased version of The Jackson 5 hit, "I'll Be There", and the original mix of Michael's "Call on Me".
The Very Best of The Jacksons (released in Japan under The Very Best Of The Jackson 5/The Jacksons (Anthology 1969 - 1987)) is a greatest hits compilation of The Jacksons during their years at Motown as the Jackson 5 to their last single released by Epic Records in 1989.
 The compilation is a joint release with Universal Music Group, Motown's current parent, and was distributed in 2004 in the UK by Sony Music.
 Featured are most of the hit singles the group, including their first hit in 1969 "I Want You Back" as well as popular hits such as "ABC", "This Place Hotel" and "Shake Your Body (Down to the Ground)".
 The compilation also includes songs Michael Jackson released during his solo career at Motown as well as a live recording of his first smash hit at Epic, "Don't Stop 'til You Get Enough".
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.
Jackson 5: The Ultimate Collection is a compilation album released in 1995 featuring the music of The Jackson 5.
 The collection features selections from the group's Motown discography (between 1969 and 1975), and is meant to serve as a condensed single disc version of the boxed set Soulsation!
 In the UK, a different track listing is used and was released as The Very Best of Michael Jackson with the Jackson Five, with a September 2001 rerelease on Island Records titled The Best of Michael Jackson and the Jackson 5ive - The Motown Years.
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).
The Jackson family is an American family of singers who originated in Gary, Indiana.
 Performing as members of The Jackson 5 and as solo artists, the children of Joseph Walter and Katherine Esther Jackson were very successful in the field of popular music from the late 1960s onwards.
 As a group, the eldest sons Jackie, Tito, Jermaine, Marlon, Randy and Michael, made the family's reputation, facilitating the subsequent success of siblings Rebbie, La Toya, and Janet.
 The Jackson 5 became known as the "First Family of Soul" (a title first held by the Five Stairsteps).
 The continued success of Michael and Janet's careers as solo artists led the Jacksons to become known as the "Royal Family of Pop".
 All nine of the Jackson siblings have gold records to their credits with La Toya holding the distinction of being the first Jackson sister to attain one (awarded by France's SNEP for "Reggae Night", a song she co-wrote for Jimmy Cliff).
The Jackson 5, or Jackson Five, currently known as The Jacksons, is a popular American family music 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.
 In 1969, the group left Steeltown Records and signed with Motown.
The Stripped Mixes (released on CD for a limited time as The Motown 50 Mixes), is a collection of American recording artist and former Jackson 5 member Michael Jackson's classic songs.
 The songs featured on the album are mainly from Jackson's career as a member of the Jackson 5 from the 1960s to the 1980s; songs credited to Jackson as a solo artist are from his albums during his Motown-era.
 Other songs included on the album are "stripped" mixes of Jackson material, meaning the songs are of a quieter tone and most of the drums have been removed.