I think it's more to do with the quality of the sound in most pop music (and I mean pop in the greatest sense—pretty much anything outside of classical, choral or operatic). There's so much distortion, fuzz and feedback (even in acoustical music) with it's poly-rhythms and multiple voices that the average person (even with good ears) isn't going to detect the difference without hearing them side by side. <br><br>I think speakers/headphones go a lot farther in deciding how things are going to sound in the end—and in turn, how easily you can or can't detect a difference.<br><br>