Well, if the music keeps playing...the track has been downloaded to your system prior to disconnecting...whether to ram or drive I don’t know.
This is one of those conversations I usually avoid...doesn't really matter what anyone thinks...you need to listen and test for yourself. I find that turning off WiFi on my Mac mini always sounds better. I always leave it off. Anyone noticed turning off your WiFi router in the house makes the system sound better as well? I have. I believe there is some interference or something degrading sound. Noise seems to find it’s way in in many forms...cable boxes, cell phones, LED/fluorescent light bulbs...