Towards the end of the musical Celia falls ill and then dies of cancer. She has fought in the revolution (at the start) and then helped run the country with Fidel. There were many rumours whether Celia and Fidel were lovers, but whatever the truth, there is no doubt that they were devoted to each other and very loyal to each other. The song would work in scene 21b Feel free to draw upon the dialogue for the lyrics.