Now that 2018 is mostly over, I want to do a special end-of-year review using one of my favourite projects of this year: https://radiostats.lw1.at/ Since middle of February, I have been recording all 1299515 times a song has been playing on Austrian radio stations.
So you can just select your favourite channel, click on "Meistgespielete Lieder", select a date range and browse through the collection of all most played songs. Find out when which song was most popular and which song just kept being played on repeat all the time.
But you can also find out what was the most played Christmas song in December 2018: It turns out it was "Driving home for Christmas" by Chris Rea (187 times), followed closely by "Last Christmas" by "Wham!" (170 times).
The most repetitive channel is by far Kronehit which has played many songs 1400-1500 times which averages to 4-5 times a day. If my calculations are correctly, they only played 831 unique songs this year.
On the other end of the spectrum there is Radio Wien which didn't play a single song more than 83 times. Another fun fact: Some songs have been played many times a day until suddenly from one day to the next it stopped nearly completely.