One can expect to find details about how Alan Freed's work influenced the development of rock and roll. For instance, his unique style of presenting music on radio might be described. His ability to sense the emerging trends in music and his courage to play music that was not yet mainstream could be part of it. It may also mention the impact of his work on the music industry as a whole, like how record labels started to focus more on rock and roll after his shows gained popularity. And it could talk about the cultural significance of his shows, how they brought together different groups of people, especially in terms of race, as rock and roll was a unifying force during that era.
It might include the names of the rock and roll artists he introduced to the public, along with the dates of their first radio plays. Also, it could list the locations of his famous shows.
Perhaps it will have a chronology of Alan Freed's major events in the rock and roll scene.