It depends on the radio station. For example in the UK each radio station had its own remit of what it plays, bbc radio 2 for example is aimed at being 80% classics and 20% new music. Each bbc radio station then makes a play list of A,B,C music with A music being played more frequently, C less frequently.
This is radio 2 playlist for today https://www.bbc.co.uk/programmes/articles/2qNJsnjYFvbLrK9CZ0CfYfM/radio-2-new-music-playlist
And an old description of how they reach that playlist
https://www.bbc.co.uk/blogs/radio/entries/6dc42e38-7c5f-3729-be7c-53f324fb7f09
A rock station obviously would have a very different remit and an upbeat radio station may still have similar A,B,C system etc but with different songs on them. Certain songs are pushed by record companies, request shows dont follow that format and obviously often each dj influences it (on some radio stations though for example they would be expected to play 50% songs from the a list)
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