While browsing YouTube, I came across a video with a song with very "sticky" tune.
The song is called "Bella Ciao". Apparently it has been very popular in Europe for a few years (actually, in the US it was rare to hear the song).
Quick search showed;
(a) originally the tune was a folk song in Northern Italy,
(b) the song was used as anti-fascist song by European Partisans in mid 20th century, and
(c) made very popular in Europe by Spanish TV-Netflix series "La casa de papel (Money Heist) "(2017/2019-2021) as its sub-theme song. The drama series was about two heists by a group of robbers targeting big national institutes (Royal mint of Spain and Bank of Spain). They used the spirits of the song as anti-authority, as the robbers go against the national police and security forces that are not afraid to kill the robbers.
I checked out a few clips, and they looked good. The clip of the Professor and Berlin (two main characters. They go by code names) singing the song over dining table was quite powerful.
The original song has either wide fluctuation of tempo from slow to fast, or goes fast. As a dance song, it is challenging (may be polka?).
But due to the popularity, there are so many versions found in YouTube.
For dances, Samba/ballroom Latin version, and Tango/milonga version, can be found.
Last night I talked with our Tango DJ David and he added the song to his computer. We may be dancing to it in upcoming milongas.