I think I can answer my own question. I have just used Michael Bedesem's wonderful Music Finder View program to load 319 of the songs that appeal to me out of the 1100 songs onto a UBS Stick and put it successfully into my PSR 750.
Therefore, I have no need to fiddle around trying to do what I was thinking of trying [see my last post of to-day]
I cannot stop thinking about how much work Michael Bedesem must have put into building Music Finder View, And to think that he lets us have it , and all for free!!! Wonderful!!! And while I'm handing out congratulations, I must add my thanks to the wonderful people who beaver away at Synthzone putting out stuff which helps learners like me. thanks,from Yammyfan Australia