Schoolhouse Rock! is an American interstitial programming series of animated musical educational short films that aired during the Saturday morning children's programming on the U.S. television network ABC. The topics covered included grammar, science, economics, history, mathematics, and civics. This television program was often rated TV-G in the United States. The series' original run lasted from 1973 to 1985; it was later revived with both old and new episodes airing from 1993 to 1999. Additional episodes were produced in 2009 for direct-to-video release.