Ideas for podcasts

For my five podcasts I have found five key ideas that could incorporate the history of radio, the first one will be the begining and how it started. The second one will be the way that radio was effected by televsion. The third one will be about the different rules of radio. The fourth will be the differnt changes that radio has gone through will satalite raido and internet radio. The final one will be the future of radio and I am planning on interviewing a disck jockey as well.