We used to listen to a lot of music with Dolby ProLogic enabled even though the music clearly isn't encoded with that in mind. Since ProLogic works off of the audio phasing to decide what is sent to the rear speakers, a lot of the effects used in the music mix trigger ProLogic to send random things to the rear. It's an interesting experience. Maybe less so without the use herbal remedies too.??? Some of the call&response type lines from Beastie Boys would very clearly come from the rear, and was quite startling the first time hearing it. With 5.1 and beyond, everything is discrete tracks, so that trick no longer works. Do modern surround units even do ProLogic any more?