Audio gear isn't limited to headphones, amps, players and files. For example, audio scientists know that ambient temperature impacts sound, due to the fact that temperature impacts the function of your eardrums. That's old news and can be confirmed by wearing your headphones on a 30F degree day both inside and outside. You'll see that the cold weather boosts your eardrum's sensitivity to bass and treble, thus creating a V signature. But leading edge science shows that what you smell, what you see and what you feel can also impact how music sounds. 1. No serious audiophile should listen to music without wearing a suitable cologne. The full range of interactions is complex, but for example, lemony notes tend to bring out the treble, coconut notes are known to bring out the deep bass in music and the smell of a fine cigar boosts mid-bass. 2. Similarly, what you look at impacts how something sounds. Contrary to popular belief, closing your eyes is not ideal. Instead, you should read something that doesn't require much effort, such as a phone book. This focuses your brain but without taxing it in any way, thus "opening it" for new information, the effect of which is to allow music to more fully penetrate the audible nervous system. Your headphones will magically produce more detail. 3. Finally, what your skin feels is also crucial. You must match each listening sessions with the right clothing, possibly a massage, and for some songs, you should also get a persian cat to put on your lap and pet. Again a full list is beyond the scope of this introduction, but a soft cotton robe brings out the warm mid-range in vocals, a massage brings out the bass and the soft fur of the persian cat helps accentuate high-mid female vocals (I notice that many headfi/SAF users are fond of cats, likely for this reason although they may not have realized it until now). The scientific connection here is still being studied, but one can't argue with the results that you'll hear. Try a blind A/B test. Additional observations are welcome as we study the issue, but please, no recommendations involving smelling one's BO while watching pornography and touching one's genitalia, as headfi has exhausted that line of experimentation to death.