Problem: Tamar Estine Herbert (nee Braxton, born March 17, 1977), professionally known as Tamar Braxton, is an American singer, television personality and actress. Braxton had her first big break in music in 1990 as a founding member of the American R&B singing group The Braxtons, formed with her sisters. The Braxtons released their debut album, So Many Ways, as a trio in 1996.

On February 25, 2014, the remix of Robin Thicke's single "For the Rest of My Life" which features Braxton, was released as a digital single. Season 3 of Tamar & Vince premiered in October 2014, and it consisted of 10 episodes just like the previous seasons. On October 6, Braxton's new single "Let Me Know" featuring rapper Future peaked at #2 on the Billboard Trending 140 chart, less than an hour after its premiere on Braxton's official SoundCloud account and eventually reached #1 by 12:00 AM October 7. Billboard.com gave the song 4 out of 5 stars in its review of "The Best and Worst Singles of the Week" for the second week of October. At the same time, Braxton, and sisters Toni and Trina guest starred on their sister Traci's music video "Last Call".  On May 27, 2015, the single "If I Don't Have You" was released. The song peaked at number 6 on the US Adult R&B Songs chart. Braxton's new album, Calling All Lovers, is set to be released October 2, 2015. On September 2, 2015, Braxton was revealed as one of the celebrities who will compete on the 21st season of Dancing with the Stars. She was paired with reigning champion, Valentin Chmerkovskiy. The single "Catfish" was released on September 10, 2015 along with the album Calling All Lovers available for pre-order on iTunes. On September 18, 2015, the single "Angels & Demons" was released. In October 2015, the group The Braxtons including Toni, Tamar, Traci, Trina and Towanda, will be releasing a new material titled Braxton Family Christmas as five members. The album was released on October 30 and pre-order on October 16th.  On November 11, Braxton revealed that she would have to withdraw from the competition due to health problems. Braxton and Chmerkovskiy finished in fifth place overall. On November 21, Braxton Family Christmas debuted at number 27 on the US Billboard R&B/Hip-Hop Albums, number 10 on the US R&B Chart and number 12 on US Top Holiday Albums on November 21, 2015. The album charted at number 4 on the US Heatseekers Albums on December 12, 2015. On December 7, 2015, Braxton received one Grammy nomination for "If I Don't Have You" at the 58th Annual Grammy Awards; Best R&B Performance from her latest album titled Calling All Lovers. In parallel, she had made a cameo on the successful TV series Being Mary Jane.

Did they go on tour?

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Problem: Keith Jarrett (born May 8, 1945) is an American jazz and classical music pianist. Jarrett started his career with Art Blakey, moving on to play with Charles Lloyd and Miles Davis. Since the early 1970s he has enjoyed a great deal of success as a group leader and a solo performer in jazz, jazz fusion, and classical music. His improvisations draw from the traditions of jazz and other genres, especially Western classical music, gospel, blues, and ethnic folk music.

From 1971 to 1976, Jarrett added saxophonist Dewey Redman to the existing trio with Haden and Motian (who produced one more album as a trio, called The Mourning of A Star for Atlantic Records in 1971). The so-called "American quartet" was often supplemented by an extra percussionist, such as Danny Johnson, Guilherme Franco, or Airto Moreira, and occasionally by guitarist Sam Brown. The quartet members played various instruments, with Jarrett often being heard on soprano saxophone and percussion as well as piano; Redman on musette, a Chinese double-reed instrument; and Motian and Haden on a variety of percussion. Haden also produced a variety of unusual plucked and percussive sounds with his acoustic bass, even running it through a wah-wah pedal for one track ("Mortgage on My Soul", on the album Birth). The group recorded two albums for Atlantic Records in 1971, El Juicio (The Judgement) and Birth; another on Columbia Records called Expectations (that included guitar by Sam Brown, plus string and brass arrangements and for which Jarrett's contract with the label was terminated within a month of its release); eight albums on Impulse! Records; and two on ECM.  Byablue and Bop-Be, albums recorded for Impulse!, mainly feature the compositions of Haden, Motian and Redman, as opposed to Jarrett's own, which dominated the previous albums. Jarrett's compositions and the strong musical identities of the group members gave this ensemble a very distinctive sound. The quartet's music is an amalgam of free jazz, straight-ahead post-bop, gospel music, and exotic, Middle-Eastern-sounding improvisations.  In the mid/late 1970s, concurrently with the American quartet, Jarrett led a "European quartet" which was recorded by ECM. This combo consisted of saxophonist Jan Garbarek, bassist Palle Danielsson, and drummer Jon Christensen. They played in a style similar to that of the American quartet, but with many of the avant-garde and Americana elements replaced by the European folk and classical music influences that characterized the work of ECM artists at the time.  Jarrett became involved in a legal wrangle following the release of the album Gaucho in 1980 by the U.S. rock band Steely Dan. The album's title track, credited to Donald Fagen and Walter Becker, bore a resemblance to Jarrett's "Long As You Know You're Living Yours", from Jarrett's European quartet 1974 Belonging album. When a Musician magazine interviewer pointed out the similarity, Becker admitted that he loved the Jarrett composition and Fagen said they had been influenced by it. After their comments were published, Jarrett sued, and Becker and Fagen were forced to add his name to the credits and to include him in the royalties.

Who are the quartets?

Answer with quotes:
From 1971 to 1976, Jarrett added saxophonist Dewey Redman to the existing trio with Haden and Motian