Bob Dorough, creator of 'Schoolhouse Rock,' has died

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Dorough's granddaughter Corin Wolf said he was diagnosed with cancer past year, but didn't disclose the exact cause of his death Monday, CNN reported.

Dorough was born in Arkansas and raised in Texas.

In 1971, he received a commission to "set the multiplication tables to music, which led to the creation of ABC-TV's SCHOOLHOUSE ROCK, Saturday morning cartoons that aired from 1973-1985, then returned for another five years in the '90s".

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.

Bob Dorough performing at Joe's Pub in NY on March 9, 2014.

The song spawned the album Multiplication Rock and the concept was later sold to ABC executive Michael Eisner, ultimately becoming the first iteration of Schoolhouse Rock!.

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"After the fully Dorough-penned Multiplication Rock, the series" contributors expanded to include Lynn Ahrens, Dave Frishberg (writer of "I'm Just a Bill") and George Newall, with Dorough staying on as musical director.

Dorough ended up writing "Three's a Magic Number".

Although he worked with greats like Miles Davis in the 1950s and '60s, it was in the early 1970s with "Schoolhouse Rock" that Dorough made his biggest pop culture impact.

"I got the idea that three is a magic number", Dorough told NPR in 2013.

According to NRP, Dorough continued to perform until his death, and was survived by his wife, Sally Shanley Dorough.