Children's music gained an even wider audience in the 1970s when musical features such as "Schoolhouse Rock!" and the original Letter People were featured on network and public television, respectively. These represented an effort to make music that taught specific lessons about Math, History, and English to youngsters through the high-quality, award-winning music. The classic public television children's show "Mister Rogers' Neighborhood" had music heavily featured as well. In the late 1970s, Canadian artist Raffi, coincided with the rise of children's music as a distinct music industry genre. Musical duo Greg & Steve have focused on the positive reaction children have to music. And former Limeliter Red Grammer has performed his children's music in every state as well as 22 other countries.