Hi,
More on UB's take.
I'm a visual person ... thus, writing something requires enough attention to be able to describe it, and bring it to life in words, or what not.
With that said, in the early days, it was music, that brought about the visuals, until the day I realized that the majority of visuals is about my "seeing", and NOT the music itself, although a person, a song, a set of words, an expression, can trigger a set of events that brings about a bunch of visuals!
As I get older, my inclination is to write, what I hear and see, and more often than not, this means ... I have to pay attention to what it is I see or hear, and (obviously) the better the attention span, the better this comes through, and the wording satisfies a lot more for me. Thus, music on the outside, or anything else, tends to distract from things.
Sidebar: Acting, in the end, is about concentration. Teaching the actor to "communicate" with the person they are with, and this is almost the same thing as what we discuss here ... you communicate with the "person" you are talking to ... which would be your imagination, or the actor across from you, or the musician you are playing with. In music, I doubt that this is harder than any other craft, and the parallels are the same. In other words, you can not be paying attention to the idea of rock'n'roll ... you have to stay with the player/s you are focused with ... which sometimes might be this person, other times another person ... but the day the piece of music "grows up" is the day that you play ... for the song, and when you get done, you don't even remember that you were tied to the drummer for 5 seconds, and the guitar for 15 seconds and what not ... which is one of the reasons, why so many DAW's are hurting people that are trying to learn to create/compose songs and other pieces of music ... you end up concerned with the metronome, instead of concentrating on the full of the visual of the music, and at that point ... the beauty of the music begins falling apar -- interrupted and influenced by externals ... just like UB states, and I do as well.
I've written about this, including exercises that can help you learn these things better, regardless of which artistic endeavor you are working on ... this is about "YOU", and not the music, the paints or the pen, or the arts, or the computer! When you have that perspective clear, the rest is fun and easy!