Schoolhouse Rock! is an American 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. The series produced original episodes between 1973 and 1986 (with 37 episodes created between 1973 and 1980, and four created as the "Computer Rock" segment between 1983 and 1984), with a return in 1993 and new episodes airing at least once a year between then and 1996, when production of the series for ABC was halted. Episodes continued to air for an additional five years after that, finally coming to an end after a 26-year run cancellation in 1999 by ABC. This television program was often rated TV-G in the United States.