I have some additional information, and I did get the player working - but ONLY in Safari.
Safari, FireFox & InternetExplorer each exhibit different degrees of functionality.
Safari works perfectly - plays music, "Play/Stop" button toggles between ">" arrow & square...speaker displays red slash on mute.
Firefox DISPLAYS the same functionality as Safari (everything appears to be working), but NO music is heard.
InternetExplorer does not function at all - "Play/Stop" does NOT toggle between ">" and square...speaker does NOT display red slash on mute...HOWEVER, Next Item & Last Item buttons do work. No music is heard. Video clips play, with sound, just fine.
Based on my experience, I'd suggest people who are having trouble with music not playing should be instructed to download & use Safari. Thanks for your help...Chris.