The Germans voted for the greatest popular tune of all time a couple of years back, and "La Paloma" won by a good margin. But the Germans preferred it sung by their own Freddy Quinn
https://www.youtube.com/watch?v=L45Fqntq8JY Forever popular in Germany, and more tango like, is "Die Capri Fischer." Recently sung by Max Raabe, an openly gay performer who generally spoofs all the classics he performs (a perfect example is his version of Tom Jones' "Sex Bomb" where his non-passionate "oh-ah" grunts is in stark contrast with the text. Capri fischer:
https://www.youtube.com/watch?v=lZqiHMEZgUw
As for the Argentinian tango, the Argentinians swear by their legendary Carlos Gardel, and accepts no real competition. It is the old Carlos Gardel hits that Iglesias sings, like the well known "Adios Pampa Mia", and "A Media Luz:
https://www.youtube.com/watch?v=RnL3GzCNLrY Luz: ] Carlos Gardel :
https://www.youtube.com/watch?v=cr4-J6l11Ashttps://www.youtube.com/watch?v=RnL3GzCNLrY