I would like to suggest a few cosmetic changes that would clean up the presentation a bit. Hope you don’t mind.
– Put the search box next to the progress bar rather than below it (perhaps put your “tag” in one line across the top right.
– Make the status bar and it’s border the same light blue color as the search box etc
– Make the songlist column dividers the same light blue colour as the border.
– Remove the songlist header gradient and make it one colour
– Make the “select” colour in the songlist the same dark blue as the “select” in the other windows .