Just like you can view your top artists, it'd be interesting to see your top writers of your songs for the given time period. Especially for pop music, the writer of a song usually leaves their signature and can be an important reason to enjoy certain songs by different artists.
To implement this, the writer (or composer/lyricist) relationships of works connected to listens could be processed so that every listen of a songs counts as one point for every attached writer (even if the artist is credited as both composer and writer), and then all found writers are ordered descending by that value.
It would be truly interesting to be able to see that info, and I can imagine this as an interesting statistics for YIM as well.