An ongoing subject in many songwriting blogs, articles and books as to whether there is a formula for a hit song and the typical conclusion is no. However their are some interesting considerations that can be taken on board when songwriting to potentially make your song hit worthy.
The digital revolution in regards to streaming, downloading and production of music has created a wealth of data that many musicians can use to effectively market their music to their key demographic. But this data can also produce some interesting facts about the songs construction and tonality.
For example Spotify regularly on its blog displays insights relating to the music distributed on their platform. One statistic in particular is the popular keys of songs on its database. Below is a graph that shows the typical keys of songs. In conclusion from looking at this graph you could determine that the most popular key of a song is G major.