Last night I just read about an interesting phenomenon called binaural beats. When slightly differing frequencies are played in each ear, humans perceive a beat at the frequency difference between actual sounds. There is a program called Gnaural which generates these. A few example schedules (outlines for Gnaural to generate sound) can be found here.There are a few other programs available (AutoZen and SBaGen) but these are not in Fedora and I do not feel like compiling them. Listening to these meditative beats is quite an interesting experience. I see potential for incorporating these into electronic music (especially psytrance), but I am no musician.