It is a post to answer Hung-Yut’s questions.
In my opinion, not all the DJs in Bs.As. do things right. I only know 3 DJs who do things right – Daniel Borelli, Carlos Rey and Mario Orlando, and I never remember who does things wrong, because I would just skip that milonga. Among that 3 good DJs, I agree with Janis, Daniel Borelli is the best in town. First of all he won’t upset me with what I wrote in my post. Second, he rarely mixes orchestras in his tandas; i.e. you can have a full tanda of Orquesta Tipica Victor but not a mix of Lomuto, Canaro and O.T.V. Daniel must have a huge collection of tango music. Third, he always forms tandas with songs from the same recording period; i.e. you would never hear a Di Sarli tanda with a mix of songs from 40s and 50s. Forth, he maintains a good balance of rhythmic and melodic tandas and he alternates them, so that we dancers would never get bored. Fifth, he never puts a single song that you don’t want to dance in his tandas. The songs he picked are not only dancable, they are really good for dancing and make you want to dance. Sixth, his tandas always go very smooth. But please don’t ask me how and what he does to make it happens. What I can tell is that throughout an evening there is not one tanda which would surprise me. In his milonga, I never suspect and wonder why he plays a tanda of D’Arienzo but not a Di Sarli tanda at a certain moment.
I might hear a “superset” once, but I wonder if it was really a “superset”. I think that was a “super-bad set”. I forgot the exact combination, but that tanda started with “Poema”, followed by 2 non-famous (for a non-argentinan like me) Gardel songs and it was ended with another unknown Canaro song. It might be a “superset” because when the DJ played this set, the organizer specially switched off the light in the milonga. I guess he wanted to create a romantic feeling. Maybe that 2 Gardel songs have special meaning, but as I don’t understand Spanish lyrics just by listening, I couldn’t tell. Other than this one, I never heard “superset” in the milongas that I went in Bs. As.. Mixed tandas appear from time to time, but they are not really “superset”.