you could as well play them strictly round robin and wouldn't notice any difference.

Well, yes - but even with my (fairly large) collection, I'd still have a problem with hearing a pattern after a while. This approach can run forever without that. I suppose that I could also play the entire list, shuffle it, and then play it again, with a small possibility of a repeat at the "join" - maybe even reshuffle if any of the X last-played songs are found in the first X entries of the new list - but I didn't think of that approach until just now. :)

-- 
Human history becomes more and more a race between education and catastrophe. -- HG Wells