I get made fun of all the time by my family and friends for how often I listen to a single song or group of songs. I have been known to repeat the same song for hours on end which is why I invested in a good set of head phones so I don't drive other people insane. I do understand that emotional respone and thank you for bringing up your own story because it reminded me that yeah I do really only ever get emotional when listening to music. An emotionally charged and motivational song will create a response in me much better than most things in the world.
I do this a lot. And I always always have a song going on in my head. I remember my college roomate remarking that it was odd how sometimes I'd listen to the same song or group of songs over and over.
I believe what we are describing is a highly emotive response to music. The visions you see in response to a song are your mind's way of interpreting "why do I feel this way?" Once when I was teaching third grade, we listened to an informal concert/discussion with a local cellist. When he began playing the opening to Tchaikovsky's "Pas de Deux" (from the Nutcracker) I started crying. Well my kids thought this was just too funny. Then the cellist began telling them a story of how when Tchaikovsky was a child, he would be so touched by a on the music box that he would cry. THEN my kids' eyes got big, and they were looking at me and whispering to each other, "mrs harris, mrs harris...." When I was a little kid, my brother and I would listen to this record of various classical songs and play "What does it make you see?"
I don't know if you will find this helpful or not, but I have a hypothesis about it. This is certainly not a scientific study; its just an INFJ connecting very few dots. But I do think that this strong sensory-emotional connection is related both to my creativity and my bipolar disorder. IOW I think that somewhere in my DNA is a network of genes that can express in a number of ways, one being musical sensitivity, and another being prone to bipolar disorder. I suspect this may be why bipolar disorder is more frequent among musicians, artists, authors, etc. I often thought to myself that I hoped my kids would inherit half those genes, enough that they could really enjoy creative expression, but not so much to put them over the edge.