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His son, Chris, says the 94-year-old Dorough died of natural causes Monday at his home in Mount Bethel, Pennsylvania.
Born in Arkansas, Dorough was able to make a living as a pianist and composer from the time he moved to NY in 1949.
If you instantly start singing along, you're of that "Schoolhouse Rock" generation that learned lifelong lessons about civics, grammar, math and other school subjects through the catchy tunes and lyrics of musician Bob Dorough. He released his first album, "Devil May Care", in 1956, and the title track would go on to be covered by Miles Davis, among others.
He later earned a bachelor of music degree from the University of North Texas and traveled to NY to work as a pianist and singer, releasing his debut album Devil May Care in 1956.
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While working with the likes of Davis, he did some work with advertising to make ends meet. That led to Donough's classic first Schoolhouse Rock song, "Three Is a Magic Number", which is remembered for its brilliant simplicity and sticky chorus that counted to 36 by threes, accompanied by animation.
Rhino Records issued a four-CD box set of Schoolhouse Rock tunes in 1996, and Disney produced a two-DVD set for the series' 30th anniversary in 2002, featuring 52 of the 64 episodes. That concept became the song "Three Is a Magic Number" and the project would become the Grammy-nominated Multiplication Rock.
Michael Eisner, who was an ABC executive in the 1970s, turned them into animated videos that aired from 1973 to 1985. He eventually settled in Pennsylvania.
A funeral is tentatively scheduled for Monday in Mount Bethel.