Most of the time, I just get this "light" feeling and the groove makes everything alright. Kind of like the best kind of buzz that you get after a nice drink.
Some days, and during some kinds of music, I will actually have everything fade out until all I can hear is the music. And then, the images and visuals will start.....
Some times, I feel like the world has changed into colors and shapes and they morph with what I'm feeling, and sometimes, I get this sort of energy flowing through me that causes me to visualize a story with the music acting as scenes from a film.
For some music, like if I'm listening to Debussy, I might get beautiful landscapes, or rivers of the clearest kind.
Afterwards, I always get this clear sense of being and I become very acute. Everything becomes very clear and defined.