This piece is a composition based on Gonzalo Macías’s book Doce Maneras de Abordar la Composición Musical.
https://www.scribd.com/document/720664690/Doce-maneras-de-abordar-la-composicio-n-musical-Gonzalo-Maci-as-1

In his first exercise, titled “Cazando una Línea” (“Hunting a Line”), Macías proposes writing down the pitch of the notes on the staff without paying attention to their rhythm.

The purpose of this is to avoid getting distracted by thinking about rhythm and pulse, and instead to focus on the creation of the melody. Here is the example obtained by the author of these lines:

Handwritten Example “Cazando una línea 2”

As a second step, Maestro Macías suggests taking that line through all the possible intervals within a key and in neighboring keys.

Afterwards, the goal is to give coherent meaning to the musical motives presented there. In my case, there are two clear motives. In measure 1, there is a long note followed by three shorter ones. In the second measure, the same note is repeated three times, creating a rallentando. This same motivic scheme is repeated in measures 3 and 4, and then again in measures 4 and 5. Measures 6 and 7 essentially serve as the closing of the melody.

If we observe the design, it is a call-and-response type melody, where the first measure presents the motive and the second provides a resolution. The rest of the composition repeats this same scheme at different pitch levels. This approach achieves melodic coherence.

In the book’s example, Maestro Gonzalo chooses to use a Fender Rhodes for his interpretation. In our case, we decided to turn it into a miniature for electric bass. Here is the final result: