Over the years I've tried just about every Windows music player - Itunes, WMP, MM, Winamp, Helium, Clementine, Zune, Foobar - and I'm sure that I've left some out.
None of these players allowed me to play my music as I wanted. I have my music stored in separate folders, Popular, Jazz, Showtunes, Plays, etc and I want to randomly play music 'FROM A SPECIFIED FOLDER' and be able to change that folder as the mood takes me. Sounds simple doesn't it? And yet none of the players mentioned above implements Auto DJ in exactly that way, they nearly all require that you change your library to suit their software.
So for satisfying my seemly mundane requirement - and for all the other good stuff in the package - many, many thanks for Music Bee Steve!