This document summarizes the story of two famous tenors, Jose Carreras and Placido Domingo, who initially became rivals for political reasons related to their home regions of Catalonia and Madrid in Spain. Carreras was later diagnosed with leukemia and found financial support for his treatments from the Hermosa Foundation, unknowingly established and led by his rival Domingo. The two later reconciled their rivalry, with Carreras publicly thanking Domingo, cementing a great friendship.