Taylor Swift _is_ on your chart (perhaps you should have included artist in something more obvious than the tooltip). Coloring the genre made the chart colorful, but there are too many genres for it to be meaningful. You exceeded the "length" of you encoding and it wrapped around. To me, it is the relatively small number of songs that made it to #1 that is surprising since there are about 80 weeks of data here. So the next thing I would probably look at is a timeline of when they hit number 1, which would give some sense of how long each song _stayed_ at number 1 (which we can't read right out of the data)

A little googling indicates that she dropped two albums in the middle of the covered time period, so perhaps there is more to say there. It would take a little more effort, but did every single song on both albums chart? How many of these are old and how many are new releases?

This is a lot of questions to try to address in a single go.