All 2,496 stations in Greater Tokyo. It came out as a map: all 2,496 Greater Tokyo stations, and the 200 melodies you can still hear. The sound site is a list of stations too, but split up by platform and by direction. So the first job was turning the song list around into a station list, then stacking all four together, one row per station. That is where the final count comes from: 200 stations, 143 of them Tokyo Metro, 55 JR East, two Toei.