It's a genre of tango music characterized by its:
* Melancholy and introspective nature: The music often expresses feelings of longing, sadness, and nostalgia.
* Slow and flowing rhythm: The tempo is typically slower than traditional milonga, allowing for a more introspective and emotional delivery.
* Lyrical themes: The lyrics often focus on themes of love, loss, and the bittersweet experiences of life.
While "sad" might seem a bit harsh, it accurately captures the emotional essence of this specific style of milonga.