This song is about how singers/"radio stars" didn't have to be flashy/attractive/etc, just have a good voice to be popular. Now a lot of them did, and it made them more popular (like Elvis and others) but it wasn't as big of a deal as it is now. When video came around, there was less of an emphasis on vocal ability as there was on attractiveness, cool stuff in the video and other stuff like that. It is similar to when "talkies" came out for movies and a lot of the silent movie actors and actresses couldn't make it after that because they had horrible speaking voices and/or acting talent. (the movie "singing in the rain" is about this).
This song is about how singers/"radio stars" didn't have to be flashy/attractive/etc, just have a good voice to be popular. Now a lot of them did, and it made them more popular (like Elvis and others) but it wasn't as big of a deal as it is now. When video came around, there was less of an emphasis on vocal ability as there was on attractiveness, cool stuff in the video and other stuff like that. It is similar to when "talkies" came out for movies and a lot of the silent movie actors and actresses couldn't make it after that because they had horrible speaking voices and/or acting talent. (the movie "singing in the rain" is about this).