Stage Door's presentation of Schoolhouse Rock Live! Too, provides a '70s nostalgia trip. The stage show -- a sequel to the popular Schoolhouse Rock Live! -- is based on the popular children's TV program which used catchy musical numbers to teach kids about everything from grammar ("Conjunction Junction") to government ("I'm Just a Bill"). The songs were written by several people, but most notable among them for Broadway lovers is Lynn Ahrens, lyricist of Ragtime and Once On This Island fame (Summerlin Library Performing Arts Center, January 21-February 4).