Hm. Maybe what you should do is have a bit of a delay? I think what is happening is that your clicking so fast it just moves right on to the next song...try this:
if mouseclick()=2 and mousex()=>650 and mousex()=<750 and mousey()=>75 and mousey()=<95 then gosub playmusic64 : wait 5
if mouseclick()=2 and mousex()=>650 and mousex()=<750 and mousey()=>120 and mousey()=<140 then gosub stopmusic64 : wait 5
if mouseclick()=2 and mousex()=>650 and mousex()=<750 and mousey()=>165 and mousey=<185 then gosub playmusic65 : wait 5
if mouseclick()=2 and mousex()=>650 and mousex()=<750 and mousey()=>210 and mousey()=<230 then gosub stopmusic65 : wait 5
if mouseclick()=2 and mousex()=>650 and mousex()=<750 and mousey()=>255 and mousey=<275 then gosub playmusic66 : wait 5
if mouseclick()=2 and mousex()=>650 and mousex()=<750 and mousey()=>300 and mousey()=<320 then gosub stopmusic66 : wait 5
If that doesn't work, try increasing the delay. And if that doesn't work then I guess I'm wrong, lol.
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