Well that was the answer. I'm such a newb I didn't realize you could change the media slideshow from what was actually playing to what you had available to play without disturbing what you were listening to. The BD does not have an artist field since it is a movie, it has an actor field, but maybe this fieldcould be added. However I had ripped a CD copy of the album, Dark Side of the Moon, and selected it from the audio menu while the BD played.
I also discovered Media Center appeared to have the ArcSoft software already plugged in so I could run it from their, minimize it and then run the theater slide show from JRiver full screen.
Unfortunately and unrelated to JRiver, the audio dropped from 5.1 to 2.0 PCM when using the computer BD drive instead of the BD player, but that is likely another issue. This was true if I used JRiver or ArcSoft to play the BD so I'm off to figure that one out.
When I do I will be set, thanks so much for sage advice.
...and MrHaugen is of course correct regarding the choice of viewing material matched to the music.