The author, Carl Boberg himself gave the following information about the inspiration behind his poem:
“It was that time of year when everything seemed to be in its richest colouring; the birds were singing in trees and everywhere. It was very warm; a thunderstorm appeared on the horizon and soon there was thunder and lightning. We had to hurry to shelter. But the storm was soon over and the clear sky appeared.”
“When I came home I opened my window toward the sea. There evidently had been a funeral and the bells were playing the tune of ‘When eternity’s clock calls my saved soul to its Sabbath rest.’ That evening, I wrote the song, ‘O Store Gud.'”
The Mission (aka Gabriel’s Oboe)
The soundtrack for the film was very well received amongst critics, being nominated for an Academy Award for Best Original Score and earning Morricone the Golden Globe Award for Best Original Score.
In the film, the theme is most prominently used when the protagonist, the Jesuit Father Gabriel, walks up to a waterfall and starts playing his oboe, aiming to befriend the natives with his music so he can carry his missionary work in the New World. The Guaraní tribesmen, who have been stalking him from a distance, approach Gabriel for the first time, puzzled by the sounds of the unknown instrument. The chief of the tribe, however, is displeased by this, and breaks Gabriel’s oboe. This marks the beginning of the relationship between Father Gabriel and the Guaraní natives.