Question: How many decades has the career spanned of the musician who was commissioned to write music for NBC's national news programs

Context paragraphs:
Jeff Rossen: Jeff Rossen (born November 13, 1976) is an American television journalist who is employed by NBC News.  He joined the network in September 2008.  Rossen contributes to all NBC News programs and platforms, including "NBC Nightly News with Lester Holt", and "Today", where he hosts the "Rossen Reports" segment.  Rossen also fills in at the anchor desk for "Weekend Today" and MSNBC.

Tom Brokaw: Thomas John Brokaw ( ; born February 6, 1940) is an American television journalist and author, best known for being the anchor and managing editor of "NBC Nightly News" for 22 years from 1982 to 2004.  He is the only person to have hosted all three major NBC News programs: "The Today Show", "NBC Nightly News", and, briefly, "Meet the Press".  He now serves as a Special Correspondent for NBC News and works on documentaries for other outlets.

Kevin Miller (radio host): Kevin Miller (born February 1968) is a conservative American talk radio host and political pundit who has been featured on various national news programs, including The Today Show, Leeza Gibbons, CNN, and MSNBC.  Miller has also been featured in "The Washington Post" and "The Baltimore Sun".

Redbank Valley School District: Over the last many decades, Redbank Valley has been known throughout the surrounding counties as prestige institution of education.  The Redbank Valley High School (RVHS) athletics, education, and arts programs have been recognized throughout surrounding districts and communities.  RVHS's "Bulldog Marching Band" was, at one point, the No. 1 marching band in the state, competing and placing high in both the North American Marching Band Association and the Lakeshore Marching Band Association.  This is followed by the fine athletic programs, that have won numerous championships across the many sports programs provided.  This has spanned across not only District IX, but on the state level as well.  Education recently topped these all, as not even a decade ago, the school district had been educating many students that would receive highly regarded majors and doctorates.

News and Views (TV series): News and Views was an early American evening news program.  Broadcast on ABC from 1948 to 1951, it was ABC's first evening news program and one of the first such programs on any television network; Both CBS and NBC also initiated their evening news programs (respectively "CBS Television News" and "Camel News Caravan", called "Camel Newsreel Theatre" at first) that same year, both debuting a few months before the first broadcast of "News and Views" on August 11, 1948.

WABE: WABE FM 90.1 is a radio station in Atlanta, Georgia, that is affiliated with National Public Radio (NPR) and Public Radio International (PRI).  WABE's format features mostly classical music, although the station will occasionally play a Beatles tune, a Broadway show tune, a film suite, or a selection from a film such as "Star Wars", as long as the piece is in a classical-sounding arrangement.  WABE-FM has lately added the short feature "Atlanta Sounds" (broadcast several times a day) and twice weekly previews of weekend events around the city.  Beginning in 2009, its Sunday schedule changed from devoting equal time to news programs and classical music to broadcasting news programs during the daytime and playing classical music on Sunday evenings.  It carries the NPR flagship programs "Morning Edition" and "All Things Considered", with newscasts interjected periodically.

The Mission (theme music): "The Mission" is a television news music package composed by John Williams in 1985.  Originally commissioned for NBC's national news programs, the theme has also been used on some NBC affiliates for their local newscasts.

Jean Vander Pyl: Jean Vander Pyl (October 11, 1919 – April 10, 1999) was an American actress on radio, television and movies.  Although her career spanned many decades, she is perhaps best remembered as the voice of Wilma Flintstone for the Hanna-Barbera cartoon "The Flintstones".  In addition to Wilma Flintstone, she also provided the voices of Pebbles Flintstone, Rosie the robot maid on the animated series "The Jetsons", Goldie, Lola Glamour, Nurse LaRue and other characters in "Top Cat", Winsome Witch on "The Secret Squirrel Show" and Ogee on "The Magilla Gorilla Show".

Al Angrisani: Albert Angrisani, also known as Al Angrisani is a leading expert on corporate turnarounds and the former Assistant U.S. Secretary of Labor under President Ronald Reagan, as well as an author and business media personality.  As a result of his professional background in the public and private sector, he has been a regular commentator on several national news programs including CNBC, Fox Business News, and Bloomberg TV.

John Williams: John Towner Williams (born February 8, 1932) is an American composer, conductor, and pianist.  With a career spanning over six decades, he has composed some of the most popular and recognizable film scores in cinematic history, including "Jaws", the "Star Wars" series, "Close Encounters of the Third Kind", "Superman", "E.T. the Extra-Terrestrial", the "Indiana Jones" series, the first two "Home Alone" films, the first two "Jurassic Park" films, "Schindler's List", and the first three "Harry Potter" films.  Williams has been associated with director Steven Spielberg since 1974, composing music for all but three of his feature films.  Other notable works by Williams include theme music for the Olympic Games, "NBC Sunday Night Football", "The Mission" theme used by NBC News, the television series "Lost in Space" and "Land of the Giants", and the incidental music for the first season of "Gilligan's Island".  Williams has also composed numerous classical concertos and other works for orchestral ensembles and solo instruments.  From 1980 to 1993, he served as the Boston Pops' principal conductor, and is now the orchestra's laureate conductor.

Supporting paragraphs: The Mission (theme music) John Williams
Answer: six decades