Music in itself carries a whole set of messages which are very, very rich and complex, and the words either serve to exclude certain ones or point up certain others.
Once music ceases to be ephemeral - always disappearing - and becomes instead material... it leaves the condition of traditional music and enters the condition of painting. It becomes a painting, existing as material in space, not immaterial in time.
Sometimes you recognize that there is a category of human experience that has not been identified but everyone knows about it. That is when I find a term to describe it.