Last week, Sound Waves took a plunge into earliest days of the music industry, outlining the historic evolution from music-related commerce generated by minstrel and vaudeville performances and sheet music sales to the advent of records. This week, we’ll see what happened to the industry as music began to be broadcast via radio.

It’s important to note it took record companies a few decades to iron out technology that had clear, enjoyable audio quality and could be made cheaply enough to be accessible to the…