Pau Casals (1876–1973) was a Catalan cellist and composer who became a global symbol of artistic integrity and moral resistance - wikipedia 
Pau Casals c. 1917 - source 
He refused to perform in countries that recognised Franco’s regime, believing music carried ethical responsibility. His silence was itself a political act.
Casals viewed culture as a foundation of peace, not a luxury. His work aligns with Cultural Dignity and the idea that beauty can oppose tyranny.
In Hitchhiker science fiction, Casals plays for extinct worlds and refuses to perform for authoritarian regimes, using resonance as diplomacy.