. ♪ ♪ opera vocalists rolf schmitz- malburg and sabine kallhammer came to teach technique and dictionrman-speaking teacher tutoring a french- speaking african how to sing an aria in italian. ♪ ♪ but when rolf and sabine moved on to the full choir, it wasn't so easy. were they pleased to see you? do you think that they said, "oh, how wonderful we have two white people here to teach us how to play music"? >> sabina kallhammer: they had experiences with other white people, so i can really understand that they were careful and a little shy. but... but they really were open to learn. >> simon: at times, they weren't sure what they were learning or why. "what was this all about?" the exercises are designed to loosen you up, the germans explained, and after a while, they did. >> kallhammer: and then, they started to sing for us, and then we were, like... ♪ ♪ ♪ ♪ ♪ >> kallhammer: their faces change when they do their music. ♪ ♪ i mean, if you live in kinshasa, there is no cultural life here, so these people have to find a way to go to some other places. making music is one way to go on a trip