Much depends on HOW YOU LISTEN. Contrary to what everybody thinks, there are MANY ways people listen to music and lots of us are NOT listening to the same things or in the same way. Example: I knew, for a while, a guy who was a jazz musician and he manufactured with his own hands, one at a time, pre-amps and amps. He was very very good at it. Somehow we got to listening and talking about cables and power cords and I had some with me and he said he hadn't heard any differences with his setup. So we changed something, don't recall what it was now, this was in the mid-1990s. He said he didn't hear a difference, I said the cable I brought had a warmer sound than what he was using. He swore nothing was different so we listened to 2 more different kinds of music, but all jazz. Nothing. Impasse. I heard something, he didn't. So I asked to to explain to me exactly what he was listening to while judging and he said he was listening to the communication between the musicians, how one setup a solo for the next guy and so on through the recording. How the ensemble played together, and how, when they were playing together, they would call and reply to each other. I'm sitting there flabbergasted. It had never occurred to me that anybody was listening to music like that. Then he said: "Why were you being so still with your eyes closed?" And I said because having my eyes open is distracting, I can't focus as much on the music. My brain uses a lot of processing power on vision, but when I turn my vision "off" (close my eyes), my hearing and focus on the music is almost like using a microscope on the music. I would listen to the QUALITY of the acoustic bass, the chest-thump from kick drums, the sounds of the body of each instrument combining with the notes, the fingering of buttons and levers on horns, reed sound, violin bow interfacing with strings right up close. Resonances of instrument bodies, tone, color... NOTHING the other guy was listening to.
If you don't listen the way I was listening (and that is FINE, if you enjoy music listening YOUR way, more power to you), you aren't likely to hear the same things I hear. When I turn on a movie with 12 channels of sound... my brain literally listens completely differently and NONE of the differences I hear with power cords and interconnects make a worthwhile change. I don't know how much brain power vision requires, but I suspect it is a lot more processing power than what is assigned to hearing. So when your eyes are open, hearing is less "focused" in my opinion. So... if you listen to music in a dark room with your eyes closed and imagine each instrument being played and how every note sounds individually and together and how big or small the recording space is or what that rumble is way in the background (some recordings I have made in a church after midnight in NYC have low frequency rumbles from the subway trains going under the church)? That's not how a lot of people listen and I would suggest, that if you aren't listening that way, don't bother with spending a bunch on cables and a $3000 DAC instead of a $200 DAC, etc. I believe the differences are real, and it is also true that what we know about signals in wires for music is incomplete. But CERTAINLY, you will never convince anybody who listens to music as just entertainment with eyes open and not focusing on anything but lyrics and melody (or how jazz musicians "talk" to each other) that cables will make a meaningful difference for them. When you aren't the sort of listener who focuses on subtle details, individual instruments and details of each note (was that a violin, or a viola? Steel, bronze, or gut strings on that guitar?), and you never focus on the size of the apparent space in the recording (left-right, sometimes front-back, and rarely high/low, live recordings of acoustic instruments in performance spaces are best for that, but some studio recordings have it too, and sometimes it is artificial but still adds interest to the music) and you are in a dark room with eyes closed and zero distractions that cables and wires will enhance their listening experience. You just aren't listening the same way (that is not good or bad, it just is what it is). So there's really no sense arguing. I hear incredible detail in good stereo recordings and I love finding every little nuance of sound over 6 or 12 listens over time. I don't focus all that much on specific lyrics, but more on the quality of the voice and how it combines with instruments. When I listen to music, within a few seconds I can go into a state where my wife thinks I am asleep, but if she walks across the room in front of me, I can "see" her outline in the soundstage of the music and more than once I've called out her name while she was trying to prove I was asleep by sneaking around while I was listening to music. Those were the few times in my life where I understood what blind people say about being able to build moderately useful "pictures" in their heads of the spaces they are in. In spite of being blind, they can sense directions in the building, large openings, generally have a fairly good idea of how big the space is, and how close or far people are. I never used to understand how that could happen until I experienced it for myself while in that music listening meditative state.
All that said, I've never seen ANY power cord change the video image quality on any digital video display from as far back as 2006 until today (and I've used more than 100 different new video displays in that time period. But change to stereo music and close eyes... whole different story. I like listening to music with AuroMatic processing (the upmixer that comes with Auro-3D). In fact, I like AuroMatic more than stereo music now because I can get music into 12 channels and all that extra information in the room keeps me from getting into that analytic mode and I can just let the music go... and I do that often because there are just times I want to relax without being focused on details.