The progress window obstructs my view of SJ, and adds one more window to my
desktop.  Why are we disabling one window and creating another to interact with?

I'd like to see a refinment where clicking the Extract button disables most of
the interface, and the button becomes Cancel.  The status bar can be used to
show the progress of the track and disc.  As an alternative, or as an addition,
the extract column could show whether the track is queued, extracting, or complete.