All electrical cables with current running through them have an electromagnetic field around them unless they are very well shielded (metal conduit is excellent.) And the field varies with the current. There is both a magnetic field and an electrical field. CRT (cathode ray tube) TV sets can be affected by external electromagnetic fields. In fact, it is by varying and controlling the field internally we control the electron beam causing it to scan back and forth, up and down between the cathode and the phosphor screen creating an image. External fields can and do modulate them, usually detrementally. And these fields can affect the flow of electrons in other wires. The Hall Effect is just one example. The question is, are these effects audible? The answer is almost undoubtedly no. While they can cause visual distortions, the ability to cause audible distortions is of a much lower order of magnitude. Take the worst case example of an unshielded power cord, say the one to your power amplifier or receiver right next to your phono cable. Put them close together along most of their entire length and you might hear an audible hum from your speakers. But move them just a few inches away or as much as a foot or two and the hum should become inaudible. The fields are not strong to begin with, they drop off with the distance, and the coupling effect is usually not terribly strong either. In the case of interconnects, the current is infinitesmal so the fields are very weak. The speaker wire carries much more current and is unshielded. Even here though, an effect is not likely. Here's an idea. Twist the left and right speaker wires together. Remove the right signal input cable from the amplifier and replace it with a shorting plug. Disconnect the left speaker cable from the speaker. Reconnect the left speaker cable to an 8 ohm 50 watt resistor, adjust the balance control to the extreme left and see if you can hear any sound from the right speaker with the volume turned up. If you can't there is no interaction worth noting.