Kevin, thanks for the link. The one I listen to is http://www.billboard.com/charts/country-songs. This is the current top 25 songs on billboard. I'll have to go listen to the songs on your link. I looked at them, and see a lot of songs I don't remember, by title. Including Alan Jackson's song. Which I don't remember hearing at all this year.
Now, interesting enough, it seems to really depends on where you live and what station you listen too. Years ago, when I lived in Denver, I was working in the DC area and would drive to Atlantic City. Several times on that drive I heard a song by Jeffery Steel which I never heard in Denver. The latest is I was listening to a Gainesville station and heard a Frankie Ballard song, "Young and crazy" I think 3 or 4 times in the span of a month. Then, I switched to a Gainesville/Ocala station and heard the song every day for the next month.
Anyway, I have bookmarked your link and will listen to the ones I don't remember. Thanks,
phil g.