Ash Wednesday & Black Flipchart Markers

Went to my placement, New College Chapel (NCC), for the Ash Wednesday Eucharist and Imposition of Ashes.
NCC has a coral foundation, which means it has a choir, one of the best in the country it appears (see). So the service is imbued with beautiful singing, which given the right posture can do something to lift you, or transport you, or just open the veil a little for a glimpse at God.
So what is it about music, and in this case a male (small and older boys) choir, that enables this momentary thinning of the veil? Why in fact, in whatever, tradition or culture, is music so linked with access to the transcendent?
My other experiences have largely been in the evangelical wing of the church, part of which was standing in a cow shed, or more latterly in a large tent, with thousands of others singing songs, which on the face of it have very little meaningful content, but nevertheless have the same thinning effect! To the extent that we were falling over ourselves to experience this thinning, or more precisely who is on the other side (as it were)
Oh, I also had a black cross on my head, which at first looked like I and the others belonged to some cult that you might encounter in a work of fiction; a cult that was either guilty of some conspiracy or there for laugh material only.
I did however, amuse myself thinking about a contextualised version of this very ancient practice that involved permanent black flipchart markers?!?!