Do you listen to your music with your eyes open or closed or a combination of both?

Closed and with the lights turned off.  I also take my glasses off.  

When I’m paying close attention to the music, I tend to have my eyes closed and the lights dimmed. I think that by reducing other sensory inputs, my focus on the sound is heightened.

I am an amateur musician, and when I play guitar, it is often with my eyes closed. I find that I can “visualize“ the fretboard better with my fingers than with my eyes. I think something similar goes on when listening to music with my eyes closed. I can visualize the placement of the instruments, “feel” the bass player’s fingers sliding over the strings, etc.

It’s not quite synaesthetic, but close. 

 Closed. to my ears it enhances the whole soundstage/imaging thingy....

Both, but I prefer to keep them open while the room is as dark as I can get it. I also always remove my glasses @immatthewj I think I read about this little tweak in Listener years ago and it definitely makes a difference, at least for me. It certainly stands to reason - you are basically removing a highly reflective surface from a spot inches in front of your ears.