The late Chilean composer Luis Advis is one of the sources of inspiration that caused Inti Illimani Historico to conceive of an album in tribute to childhood. Again, nothing says so in the compact disc liner notes. However, from "La Cancion en el Sombrero":

quoting Horacio Salinas
One of us had a cassette tape called "Cachencho en la playa," with songs composed by "Lucho" Advis in the early 1970s.
"Introduccion Musical" is in reality the introduction on the "Cachencho en la playa" cassette, constructed by Advis in order to demonstrate diverse musical motifs which are to appear later in individual songs. We [Inti Illimani Historico] put this introduction as the final track on the compact disc, because it is "una travesura" -- a trick, a mischief. endquote

Luis Advis was a Nueva Cancion exponent during his lifetime, and Inti Illimani worked with him before the years of European exile. If I am not mistaken, it was the composer Advis who took poetry of Violeta Parra, poems which Parra herself had not set to music, and composed an album-length cycle of song of Parra's poetry, "canto para una semilla" (1972).

Advis had passed away in 2004, and so he was dead by the time Inti-Illimani Historico came together to record Travesura; some, if not all, of the album could be considered a tribute to Advis and to the work that he and Inti-Illimani had done together thirty years earlier.