The Canadian National Anthem
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Before the official adoption of "O Canada" in 1980, the official national anthem of Canada was "God Save the Queen", yet "O Canada" was used on an unofficial basis, as well as the patriotic song "The Maple Leaf Forever"
Canada, being a former British colony (and "O Canada" being composed not that long after independence was granted), has its anthem in the "Western hymn" style of anthem.
For the past few decades, there has been an on-again/off-again movement to once more slightly alter the English lyrics of the national anthem, from "In all thy sons command" to "In all thy hearts command", to be more inclusive.
It is interesting to note that, while having both English and French lyrics (Canada is an officially bilingual country), and both languages' version of the anthem share the same melody, each official language has different words for the anthem.