Bob Dorough, the jazz musician who taught reading and math to millions of kids when he created Schoolhouse Rock, has died at the age of 94. CNN reports that Dorough's granddaughter didn't disclose the exact cause of death, but she did say that Dorough had been diagnosed with cancer last year. He was inspired to create Schoolhouse Rock after an ad exec approached him in 1971 and asked him to set multiplication tables to music to help his sons learn math. The result was the song "Three Is a Magic Number." Schoolhouse Rock, which also produced such classics as "Conjunction Junction" and "I'm Just a Bill," premiered in 1973 and ran on ABC for 12 years, then returned for five years in the 1990s.
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