Are you a DJ and for the moment unsure about a song; Is it danceable or not? Does it put the dancers in fire?
According to a colleague of yours you can use the Youtube as tool to check it out!
If there is a lot performances using that song it could be a real hit at your milonga!
But pay attention! There are fals friends like Libertango
It is enormous popular as a exhibition song but it is very seldom played in a milonga. I think the only occasion per year for me is the summermilonga; a large informal outdoor milonga for several hundreds of dancers every Friday night - there we will hear it even this summer the Gace Jones version, please!
Here is the portal I builded around this song. The subtitles poping up give you a playlist, just cklick the smal video icon to choose that path!
(This youtube solution works only on a computer, sorry for that)