One interesting question is whether the chart data here can help to illuminate any long term trends in chart success. For example are songs getting longer?
Obviously this data can only address the topics that it measures, that is the popularity of songs, artists and titles. The distribution of chart entries is clearly tied closely with the years being considered, so as with the determination of the most charted songs we have to compensate for that. When considering sales we have to find a way to estimate historic markets. Once the scores have been adjusted to give each year an equal chance of producing the top songs it is interesting to see which years they actually come from. The plot above takes the top 6000 songs and shows the years that they came from, the top 500 in the far row, 501-1000 in the next and so on down to the positions 6001-6500 in the nearest row. The years 1900-1920 have been removed because the charts are too sparse to be valid. Clearly the years 1940-1945 were not good years for general musical success, a tiny number of songs got all the attention and no-one else got anywhere, we guess people were focused on some othe
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