Elaine Paige tops them all with the terrible Spanish pronunciation and not because of an accent--that's normal--but for saying something waaaay off from what was actually meant.
She starts off fine, with your standard accent:
"Ree-oh! Deh lah blah-tah!"
Then it all just goes wrong from there. XD
"Flour-ee-doh! Cogentes nuov-o day ooo-eee-oh!"
Julie Covington's "daycamisados" is grating for how simple it is to correct but nobody ever thought to which means nobody looked into any of that beforehand! That's where authenticity is important. Even today, nobody cares about stuff like that and it takes an actual Argentinian to do it justice, lol. Instead they obsess with making realistic, naturalistic scenery and making everything all so tangoey and latino and blah, blah, blah. Snore...
Props to Patti LuPone for not only rocking the sh*t out of this score but for actually saying those Spanish lines in "Buenos Aires" so well, I remember wondering if she was Hispanic herself!
Recreation of original John Cameron orchestration to "On My Own" by yours truly. Click player below to hear.