Music, and indeed any art form, involves striving to express that which is recognised but cannot be fully put into words, that which is unknowable and yet known more deeply than anything else. It is this striving for expression that produces great art, it is the acknowledgement – without complete understanding – of the intangible Other that drives creative work.
This is not unique to Christian cultures, it is a universal feature of art. We do not express artistically what we could simply describe succinctly and fully, in a sentence. The intangible natures of love, of the soul, of our deeply felt and yet deeply fractured relationship with God, these are the things which give flight to the mad impulses of the artist.