Widely known, the song "Desafinado,"¹ celebrates the beauty and imperfection of love as musical notes, which never harmonize perfectly, yet still find some harmony together.
The structure and musical harmony of this composition reflect the song's theme with innovative chords and progressions and jazz dissonances, which at the time, caused bewilderment and criticism.
Musical art has always faced dissension and discord, and contrary to popular belief, its history shows us that there is no absolute standard tuning. What exists are accords—the origin of the musical term "chord." There are tempered tuning systems that slightly detune all notes so that no interval sounds too harsh, even if none sound perfectly right. We can therefore say that tuning is about trying to blend sounds, but that there is no formula that blends them all harmoniously. There are arrangements, tunings, and temperaments that are more or less acceptable, depending on the purpose, practicality, desired musical atmosphere, etc.
We can therefore propose that desafinado imposes itself as a real in the musical field, an irreducible and driving factor, since it is precisely because of the absence of perfect tuning that so many modalities of tuning have come into existence.
If there is no sexual tuning, there are, however, as in music, possible tunings between the sexes. We must ask ourselves what, in our terms, these notes, rhythms, irrational numbers, clouds of infinity could be, which would offer us resources for this invention. The tables of the formulae of sexuation assist us, but it still seems too rigid to compose the precise tones and colors for these harmonies and chords.
The theme of tuning also highlights that, in order to tune in with another person, "if you say I'm out of tune, my love," it takes listening, art, a touch of formalization, decision, and choice, which suggests that we are dealing with mathemes, aesthetics, and ethics when we hear how out of tune we are and how out of tune the world is around us.
It is possible that speaking beings live according to the Witz shared among musicians who play string instruments. They spend half their time tuning their instruments and the other half playing out of tune.

^[1] Jobim, A., Mendonça, N., "Desafinado," originally written in 1959 and performed by several different groups. Cf. "Desafinado," Getz/Gilberto, 1964, available online: Spotify. [Editor's note: the Portuguese word desafinado is often translated into English as "out of tune" or "off-key."]