Of all the lists of neo-tango or alt-tango song suggestions I can’t remember one that I listened to1 that I jumped at going ‘that’s a tango!’.
One example would be Maroon 5′s Secret
I just don’t get the tango in that. (Now I might if it was three in the morning and I had danced every tanda since I’d arrived).
I, personally, am fond of The Loneliness of a Tower Crane Driver by Elbow. But that is because it provided an a-ha! moment. Also Guy Garvey’s singing is two fingers to those who say that only tango is sung with emotion. I play it when doing exercises.
My point is neo/alt-tango is very much something of individual taste. You might like a particular song and think it is danceable but you may have had the song on repeat for the last month. Not everyone is going to hear what you hear.
1There may be ones out there beyond my reach that do work.