Carlos Gardel is singing in the concert, the song is an obvious playback of the original Tango singer, Although in the song sounds a bandoneon and a violin, in the shot, Gardel is alone in the stage just with four guitar players.
The character that plays Carlos Gardel in the sequence for the concert, sangs a few lines in front of an old microphone, and then he walks from one side to another side in the stage, singing with the same voice amplification too far from the old microphone. In those days, the singers could not make such movements due to the short range of the 1930s microphones.