Bach/Busoni Chaconne in D minor from Partita for solo violin: bedrock Bach. I hear solid ground set down by Johann Sebastian Bach on which Western Classical music has been built – harmony, sequence, cadence. Solid, fundamental, progenitive, massive, permanent. Resonant, spreading outwards and forward right to the day on which I am listening, and for years beyond. Bedrock D minor; unmoved, unmovable D minor. I do hope so……