Describe the state of radio programming prevalent in the late 1940s, just before the Top 40 format was developed, and describe Top 40 as well.

What will be an ideal response?

Into the late 1940s, radio stations used general entertainment formats that mixed comedy, drama,
and variety shows with music. When radio’s programming migrated to TV, radio responded with the Top
40 format. Top 40 imitates a jukebox, programming a short list of repetitive, chart-topping music that is
tightly focused all in the same genre.