Two ways of hearing these two sets of 9 pieces:
first separate, then alternating.
And all of a sudden 800 years of temporal distance seem to dissolve and the pieces communicate with each other.
Isn’t one even tempted to think, that John Cage wrote his pieces
to be combined this way with Hildegard von Bingens songs, as an attempt
to overcome the “nasty ditch” (Lessing) between two
completely different historical situations?