There was a small disagreement as to whether audiophiles can hear music at 20 khz. I made the claim that I could hear at 20 khz and that it has a holographic effect. As well it takes on a omni-directional quality.
Of coarse not all music has 20 khz content. With my collection it is usually found in Electronic music.
Here is a good article on the subject, that explains in better detail. 
Link:
http://www.silcom.com/~aludwig/EARS.htm
Hi Mag,
The most interesting point of your suggestion is that you find the "higher" frequencies to have an "omni-directional quality", when the higher frequencies tend to be perceived with greater directionality in general,

and it is the lower frequencies that have spatiality.
That is, it is the higher frequencies that give us "pinpoint" imaging and location. Sounds like you are hearing a more diffuse dispersion of those frequencies. Maybe from a very lively room.
As well if it is with mostly electronic music, the perception may be due to a "phasing" of those frequencies which could cause them to be perceived as more diffuse.