I played in the marching band for our high school's football and basketball games and most (probably all) schools in our conference just used college fight songs with modified lyrics. (Our school song was Notre Dame's fight song, another school had On Wisconsin, etc.)
I ended up going to IU, so the joke's on them :P
For that matter, my junior high school's song--which I hadn't thought of in many years, used the tune of "Hail to Thee, Cornell" or whatever that is actually called.
Colorado School of Mines, and I'm sure others, use the same tune.
This was actually the anthem of the Austrian monarchy (introduced in 1797, in official use from 1826 until the end of the monarchy in 1918). Some Austrians are still hearing the original text ("Gott erhalte, Gott beschütze / Unsern Kaiser, unser Land!") whenever the "Deutschlandlied" is played.
Before the "Deutschlandlied" was introduced in 1922, the Prussian anthem "Heil Dir im Siegerkranz" was in common, but not official use in the German empire (1871). This one used, like many others, the melody of Britain's God Save the King/Queen.
[Edit] The anthem of the Habsburg-empire is a bit tricky in terms of plagiarism: The melody was composed by Joseph Haydn in commission by Franz II. (later Franz I.), but was also part of the "Kaiserquartett" (op. 76 no. 3, also 1797). Here, there are some similarities to an earlier composition by Mozart ("Exsultate, jubilate").
So our lyrics of our National Anthem now consist of all the fragments people could kinda remember all smashed together, including some parts that make no sense (Can any Spanish speaker tell me what the word "infausto" is supposed to mean?).
The gaps in the melody were filled by copying La Marseillaise, I believe.
This is the first line of the Paraguayan National Anthem:
"A los pueblos de América infausto tres centurias un cetro oprimió"
Parsing that sentence is a common exam question for college admissions.
There are also several bars ripped off from Paganini.
See: https://en.wikipedia.org/wiki/List_of_historical_national_an...
If you claimed you wrote the tune when you borrowed it, sure, that's plagiarism. But setting words to an existing tune while acknowledging that you are doing so is perfectly okay.
But it's interesting how even countries share melodies
