He began his career as a singer/composer/arranger in the 1950s and ’60s, working with (among others) Miles Davis and Charlie Parker. “Then, in 1971, with the jazz money running thin, Dorough was asked by his boss at the advertising company where he had a day job to set the multiplication tables to music; his boss cited his children’s ability to remember Hendrix and Rolling Stones lyrics, but not their school lessons.” And so it began …