How does a song climb the music charts?
The more requests it gets the higher it climbs. Even if they are not playing it right now. Plus a lot of PR from the artist. There are some stations that will play it before it reaches # 35. That is part of the advertising for it. If it was released as a single then it will depend on the sales. It is harder for a song to climb the charts if it was not released as a single. So it all comes down to how many people are willing to pay for it.