Song chart Japan Tokyo
Japan is the second largest music market in the world, but obtaining reasonable historic chart data is really quite difficult. This is a weekly top 100 chart from 1988 to 2008 for Tokyo (source //www.j-wave.co.jp/original/tokiohot100/ cgi-bin/top100.cgi).
We have to rely on automated translation tools (our Japanese is not good enough), these have some issues with converting artist names and song titles that are not in Latin text. In addition there are inconsistencies between the names of the same songs from one week to the next. We have tried to make the names consistent and map them as best we can, but there are more corrections to be made.
We would be glad to hear from anyone who can tell us where to get validated charts for Japan from before 1989.
The attributes we use from this data are:
There are a wide range of ways to assign scores to artists in order to work out which artists are most significant. Here is one listing, of the top five artists of each half decade within this chart. This has been calculated using a score that combines the position and the number of weeks in the charts.
If we want to compare artists across the whole duration of this chart we need to remove the systematic bias that comes from the different chart dynamics for different eras. We can do that by first ording all the songs by success within a given year and then using this order to define a score (for example assigning 1.0 to the number 1 song, 0.5 to the number 2 and so on).
A number of song titles have been hits for more than one artist. Here are the twenty titles that have spent the most weeks in the Tokyo charts.
The peak position that songs reached in the Tokyo charts.
The month in which a song first entered the Tokyo charts.
The number of weeks that the average song spends in the Tokyo chart has changed quite dramatically over the years. We have no good idea why this should be.