This is just a minor tweak that I'd like to see. When you use the auto-size columns option in the Now Playing list with short artist names, I don't think the artist column is as thin as it could be.
Here's an example with the artist, GZA, after auto-sizing the columns: -
The width of the artist column could be less to fit more of the track names in, for example, I think this would be better (done by manually resizing): -