That is not quite true. I don't know where you live, but I can turn on the radio and have access to rap, r&b, rock, classical, country, latin, ...etc nearly at all hours of the day.
The average person has access to all sorts of music on the radio. It is just a matter of what he/she grew up with and what his/her preferences are.
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Thats true, I'm really just going by what I know being up here in Detroit Michigan. I get like, two classical stations, and one Jazz/Blues station. The rest are like rock or Rap. I know that when I leave this area though, I hear a lot of Country on the radio.