Network commercial structures were solidly in

place but by 1935 about 1/3 of all network

radio programming was still unsponsored and

offered "in the public interest" at the

networks’ expense. Educators thought that

ratio was insufficient

notwithstanding the fact

that network programs like

the CBS “American School

of the Air” and NBC’s "Music Appreciation Hour”

(hosted by the NY Symphony’s conductor,

Walter Damrosch) represented considerable

educational undertakings.