When the music (doesnt matter what kind) has some "breath of life" as I call it. In other words, if, when you play the music your ears might accept it as actually happening instead of a mere recording of something. Dynamics and fidelity come first. Your ears want to hear something that sounds lifelike no matter what the type of music. From birth you have been unconsciously taught to survive by using your wits, eyes and ears. Your ears need to be able to tell you if there is danger, the sound of a friendly voice or whatever. We are "tuned" to this whether we realize it or not. Well, when we hear music we struggle to make sense of it; is it happening in a real space, etc. When we can put a mental "picture" to the music we can enjoy it better. Its hard to do this with purely electronic music, but we are getting so used to that sound now (after years of synths, Star Wars, etc.) that its becoming a reality just like a violin. We do strive to makes sense of noise though, and the more dynamic something is (even if its a sound that does not occur in nature) the more our ears can accept it as "fact" instead of fiction. That helps.
Remember, our ears are pretty smart.
We can recognize a voice over a really tinny cell phone speaker, so its not about total fidelity. Its about the idea that the more lifelike something sounds, the better we can enjoy it. You can be walking on a street and hear inside a club some music playing and you will know instantly if there is a live band in there or not. Im sure weve all experienced that. We are nowhere near the band, but even from a block away we know its live. It has certain musical and sound "cues" that clue our brain to the excitement of live music.
Dynamics have a lot to do with it. When a drum set is being played, the cymbal vibrates at a different frequency than the snare drum and at a different volume. When our recorded music faithfully reproduces this, we can be "fooled" into thinking that its actually happening. That always makes the listening experience better.
Also, when people are all playing together in a room, the sound is bouncing off the walls, ceiling, etc. and this all hits our ears at different times. When this can be reproduced on a CD or album, its all the better for us. Close micing techniques of most modern music can really spoil this illusion. Think about it; no one listens to a hi-hat cymbal on a drum kit from one inch away from it. Well, that is where the microphone is! If the engineer moved the microphone back about two feet the sound of the hi-hat would mingle with the sound of the rest of the kit and the room and (like a good sauce in cooking) everything would simmer together better.