A brief history of radios, what it looks like in this day and age, and why people use it. Sources: • https://www.statista.com/statistics/184182/estimated-revenue-of-us-radio-broadcasters-since-2005/
• https://www.radioworld.com/news-and-business/why-do-listeners-listen
• https://blogs.ubc.ca/etec540sept12/2012/10/28/1687/
• https://www.radioworld.com/news-and-business/programming-and-sales/growing-percentage-of-audio-listening-now-happens-on-mobile