I've noticed more & more music, when listened to through headphones, comes off as very centered. As if the entire thing is playing right in front of your face all lined up or piled on top of each other. When I listen to my older stuff (Floyd, Tom Petty, RHCP etc) guitars have definitive placement in the left or right channel and the drums bounce around. Or in some cases instruments are heavy in one channel but exit in the other. The music dances around and it feels like it's all around me and you really get a chance to concentrate on the sounds going on. There are the occasional bands that do break it up, but the larger portion just have no production value to them. And the other thing that bothers me is many no longer do live recordings. They record one perfect note and the computer repeats it to the timing of the song as needed. So you don't get that sound of a guitarists fingers sliding on the strings or the ever so subtle squeaking of the drummers foot pedals.