Also, if user right clicks AW's PN page (without any selection), only that option appear ("Show it as window"). IMO, the correct context items should be "Clear Playing Now", "Shuffle",...
By the way, I never use "Clear Playing Now". Instead, I send something else to it. However, I showed MC to two persons, and I tried to teach them basic functionality. Both persons asked me how to clear playing now. In their opinion, that was a basic option, and expected to find it in their faces...
These two persons used MMJB, so I checked how it works and how it looks. IMO, it is ugly, and lack a lot of basic features (to me), but it have a button to "Clear Playing Now" in his "Action window".
MMJB play controls (play, stop, next, fwd, pause) are similar to your logo. So a MMJB user tried to control playback by clicking the default cover art (it appeared in a Track info visualization). I get so surprised, but I understand his reaction (I've seen MC evolution, he does not).
I suggest you to analyse what a MMJB user (and WMP's, and Real One's) expects to find in a jukebox. You should try to make migration as easy as possible.