This is a song sung by Che Guevara, although Fidel may join in – see scene 13b and it should cover Che’s arguments about international solidarity and why he wants to export revolution to Latin America. The song can adapt the text for the lyrics.
Or you can also talk about Cubans support for the struggle against apartheid in Africa as an example of international solidarity – simply Google ‘Cubans fight apartheid’ and you’ll find out more. A scene can be written to support a song about Cuban activity in Africa.
An example of a stirring song is ‘You’ll never walk alone’ from the musical Carousel, which captures such sentiments.