Nice and interesting topic.
Some points -

1. No clear description of the datasets is given. (You have been asked to describe the dataset). Also, please be more specific about how you will combine the datasets.
2. I believe using the dataset for the timeline regarding major shifts in history should have been incorporated while describing datasets as you are trying to study if major events have some relationship with the change in taste of music.
3. While writing background, if you are saying that Some described the most commonly mentioned words in the song, reference the paper/ link over here itself as [1] or [2].

Overall good plan to work on.
All the best!