How are radio tops made? Who decides which songs are the best?

This seemed never clear to me cause you always hear songs on the radio and I really doubt if an ordinary person gives feedback about every song, mainly because it's time consuming, so there has to be someone above to decide the tops. Who does this job? Is it a team of composers and music-related specialists,... show more This seemed never clear to me cause you always hear songs on the radio and I really doubt if an ordinary person gives feedback about every song, mainly because it's time consuming, so there has to be someone above to decide the tops.

Who does this job? Is it a team of composers and music-related specialists, is there any influence from companies who pay them so the song would make the list?
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