Answer the question at the end by quoting:

Tristano was born in Chicago on March 19, 1919. His mother, Rose Tristano (nee Malano), was also born in Chicago. His father, Michael Joseph Tristano, was born in Italy and moved to the United States as a child. Lennie was the second of four brothers.
Tristano is regarded as one of the first to teach jazz, particularly improvisation, in a structured way. He taught musicians irrespective of their instrument and structured lessons to meet the needs of each individual. Lessons were typically 15-20 minutes in length. He did not teach the reading of music or the characteristics of different styles of jazz, instead challenging students in ways that would allow them to find and express their own musical feelings, or style. Foundational elements for a student's learning were having a concept of (principally diatonic) scales as music and a basis for harmony. One of the teaching tools often used by Tristano, including for scales, was the metronome. The student set the metronome at or near its slowest setting initially, and gradually increased its speed, allowing a sense of time to develop, along with confidence in placing each note. Tristano encouraged his students to learn the melodies of jazz standards by singing them, then playing them, before working on playing them in all keys. He also often had his students learn to sing and play the improvised solos of some of the best-known names in jazz, including Parker and Young. Some students first sang solos from a recording slowed to half the normal speed; eventually they learned to sing and play them at normal speed. Tristano stressed that the student was not learning to imitate the artist, but should use the experience to gain insight into the musical feeling conveyed. Such activities stressed the value of ear training, and the idea of feeling being fundamental to musical expression. All of this preceded having the opportunity to improvise during lessons.

did he teach anyone famous?

Some context: Hanson is an American pop rock band from Tulsa, Oklahoma, United States, formed by brothers Isaac (guitar, bass, piano, vocals), Taylor (keyboards, piano, guitar, drums, vocals), and Zac (drums, piano, guitar, vocals). Supporting members include Dimitrius Collins (keyboards, guitar), and Andrew Perusi (bass) who have toured and performed live with the band since 2007. They are best known for the 1997 hit song "MMMBop" from their debut album released through Mercury, Polygram, Middle of Nowhere, which earned three Grammy nominations. Despite the enormous commercial success of Middle of Nowhere, the band suffered from the merger that eliminated their label, Mercury Records .
In the early to mid-1990s, Isaac, Taylor and Zac sang a cappella and recorded such classic songs as "Rockin' Robin", "Splish Splash" and "Johnny B. Goode", as well as their own material. Their first performance as a professional group took place in 1992 at the Mayfest Arts Festival in Tulsa. They were known as the Hanson Brothers, before shortening the name to Hanson in 1993. Hanson also appeared on Carman's Yo! Kidz: The Vidz, which cast Taylor as a young Biblical David facing Goliath, Isaac as an event announcer, and Zac and other members of the family in the stands cheering on this "sporting event". All three boys started their musical careers as pianists, but Isaac eventually started playing guitar and Zac started playing drums, while Taylor continued as the keyboard player. The band recorded two independent albums in their hometown of Tulsa, Boomerang (recorded in autumn 1994, released in 1995) and MMMBop (released in 1996). The latter featured the original version of the song "MMMBop", which would later become the runaway single on their debut commercial record Middle of Nowhere. The boys then found themselves at the South By Southwest (aka SXSW) music festival in Austin, Texas. There, they were promptly signed by manager Christopher Sabec. He shopped them to several record companies, most of which dismissed the band as either a novelty or fraud before Steve Greenberg, an A&R representative for Mercury Records, heard them play a set at the Wisconsin State Fair. After this performance, they were signed almost immediately by Mercury. They soon became a worldwide sensation with the release of their first major-label album, Middle of Nowhere, which was produced by Stephen Lironi and the Dust Brothers.
What year did they change their name
A: 1993.

IN: Brown was born on July 28, 1891, in Holgate, Ohio, near Toledo, into a large family largely of Welsh descent. He spent most of his childhood in Toledo. In 1902, at the age of ten, he joined a troupe of circus tumblers known as the Five Marvelous Ashtons, who toured the country on both the circus and vaudeville circuits. Later he became a professional baseball player.

In 1939, Brown testified before the House Immigration Committee in support of a bill that would allow 20,000 German Jewish refugee children into the US. He later adopted two refugee children. During WWII, he spent a great deal of time entertaining troops, spending many nights working and meeting servicemen at the Hollywood Canteen. He wrote of his experiences entertaining the troops in his book Your Kids and Mine. Joe E. Brown's other two sons were in the military service. In 1942 Brown's son, Captain Don E. Brown, was killed when his A-20 Havoc crashed near Palm Springs, California. At 50, Brown himself was too old to enlist, but he traveled thousands of miles at his own expense to entertain American troops. He was the first to do so, traveling to both the Caribbean and Alaska before Bob Hope had, and before the USO was organized. "While big USO names like Bob Hope did not visit the Leyte, Philippine area my father was in (housing was not good), Leyte received any number of entertainers during the war. Dad said the entertainers were all just a bunch of nice people. One group in particular was the top actors from a very popular and large musical of the times. Dad and a few of his buddies would walk back to the tents that housed the USO performers and would visit with them. Mostly, the USO performers were curious about the events on the islands and how the men were handling things. One performer, a "wonderful comedian" named Joe E. Brown, would commandeer a military vehicle and be driven around the island. The entertainer would stop military pedestrians, "ream" them for some inconsequential matter, start laughing, then invite them into the cab so they could be driven to their destinations. Joe E. Brown was greatly appreciated." (Memories of Capt. Donald Courtright, told to his daughter Mary in 2011.) On his return to the States, he brought sacks of letters, making sure they were delivered by the Post Office Department. He gave shows in all weather conditions, many in hospitals, sometimes doing his entire show for a single dying soldier. He would sign autographs for everyone. Brown was one of only two civilians to be awarded the Bronze Star in WWII.

What sort of work was he doing?

OUT:
One performer, a "wonderful comedian" named Joe E. Brown,