Answer the question at the end by quoting:

Martha and the Vandellas (known from 1967 to 1972 as Martha Reeves and the Vandellas) were an American all-female vocal group formed in 1957. The group achieved fame in the 1960s with Motown. Selected Members of the group were inducted into the Rock and Roll Hall of Fame in 1995. Formed in 1957 by friends Annette Beard, Rosalind Ashford and Gloria Williams, the group eventually included Martha Reeves, who moved up in ranks as lead vocalist of the group after Williams' departure in 1962.
Following their signing to Motown's Gordy imprint in 1962, the Vandellas struck gold with their second release, the first composition and production from the famed writing team, Holland-Dozier-Holland, titled "Come and Get These Memories". It became the Vandellas' first Top 40 recording, reaching number twenty-nine on the Billboard Hot 100 and peaking at number six on the R&B chart. Their second hit, "Heat Wave", became a phenomenal record for the group, reaching number four on the Hot 100 and hitting number one on the R&B singles chart for five weeks. It became their first million-seller and eventually got the group their only Grammy Award nomination for Grammy Award for Best R&B Performance. (On the single and album, the song was titled "Heat Wave". It was sometime later that the song was retitled to avoid confusion with the Irving Berlin song.)  The group's success continued with their second Top Ten single and third Top 40 single, "Quicksand", which was another composition with Holland-Dozier-Holland and reached number eight pop in the late fall of 1963. Around that time, Annette, who was pregnant with her first child and set to get married, chose to leave her singing career behind by 1964. Betty Kelley, formerly of the Velvelettes, was brought in shortly afterward to continue the Vandellas' rise.  The next two singles, "Live Wire" and "In My Lonely Room" (#6 R&B Cashbox) were less successful singles, failing to reach the Top 40. However, their next single, "Dancing in the Street", rose up to #2 on the Billboard Hot 100 and also found global success, peaking at #21 on the UK Singles Chart in 1964. In 1969, "Dancing in the Street" was re-issued and it was plugged heavily on radio stations. It did not take long for the song to peak at #4 in the UK, thus making the song one of the all-time favourite Motown single releases ever. The song became a million-seller, and one of the most played singles in history.  Between 1964 and 1967, singles like "Wild One" (US #34), "Nowhere to Run" (US #8; UK #26), "Love (Makes Me Do Foolish Things)" (US #70; R&B #22), "You've Been in Love Too Long" (US #36), "My Baby Loves Me" (US #22; R&B #3), "I'm Ready for Love" (US #9; R&B #2; UK #29) and "Jimmy Mack" (US #10; R&B #1; UK #21) kept the Vandellas on the map as one of the label's top acts. The Vandellas' popularity helped the group get spots on The Ed Sullivan Show, The Mike Douglas Show, American Bandstand and Shindig!. Throughout this period, the Vandellas had also become one of the label's most popular performing acts.

What were some of their major hits?

Their second hit, "Heat Wave", became a phenomenal record for the group,

IN: Reasoner was born at First Street North in Dakota City, Iowa; he and his older sister, Esther, were the children of Eunice (Nicholl) and Harry Ray Reasoner, who married in 1911. Reasoner was taught to read by his parents before entering school, gaining a strong vocabulary from his mother. Reasoner attended West High School in Minneapolis. During his time at the school, Reasoner developed his interest in journalism.

Reasoner took part in covering the John F. Kennedy assassination on Friday, November 22, 1963. Walter Cronkite and Charles Collingwood had been switching back and forth to report on the incident for about four hours after Cronkite initially broke the news at 1:40 p.m. EST. Reasoner took over the anchor chair after Collingwood tossed it to him at 5:49 p.m. EST and opened with the repeat of an announcement by Frank Stanton, the president of CBS, which had already been relayed by Collingwood:  He later reported on the arrival of Kennedy's body in Washington, D.C., and provided details regarding Lee Harvey Oswald (who was then accused only of killing Dallas Police Officer J. D. Tippit; he would be accused of killing the president only hours later). Reasoner left the desk when Cronkite returned to anchor CBS Evening News at 6:35 p.m. EST. He reappeared in another studio, approximately two hours later, to narrate a special program called "John F. Kennedy -- A Man of This Century", and he talked about Kennedy's career and the new president, Lyndon B. Johnson and announced the conclusion of CBS's coverage for that day. (Reasoner also anchored the final coverage of the next day, with a CBS News special titled "A Day to Mourn".)  Reasoner's next appearance came two days later, Sunday, and as Reasoner was at the anchor desk, Oswald was shot by Jack Ruby while being moved in the Dallas City Jail. At that very moment, Roger Mudd was filing a report from Washington, describing the President's funeral arrangements.  At this point, CBS abruptly cut back to Reasoner at the newsroom anchor desk with breaking news.  At the time CBS picked up KRLD's live feed of the city jail basement, Oswald was lying on the floor and Dallas Police were apprehending Ruby. KRLD's reporter on the scene, Bob Huffaker, was heard to say, "Oswald has been shot, Oswald has been shot". After the ambulance carrying Oswald sped out of the jail en route to Parkland Hospital, KRLD switched back to CBS in New York, where Reasoner replayed the tape from the beginning so the viewers could see Ruby shooting Oswald. Several minutes later, he reported that the Dallas Police had released Ruby's name. (Reasoner was not at the anchor desk when Oswald was declared dead since he had been replaced by Cronkite.)

what was his biggest contribution to the assassination

OUT:
Reasoner's next appearance came two days later, Sunday, and as Reasoner was at the anchor desk, Oswald was shot by Jack Ruby while being moved in the Dallas City Jail.