Question: What might be a plausible language origin of the word, "lelo" as used in traditional jibaro musical form of Puerto Rico.
The word lelo is intensively used in the introduction of jibaro folkloric music of Puerto Rico. A classic example can be found in a traditional musical song form known as a decima: Florencio "Ramito" Morales Ramos: Sies Con Decimas.
Curiously while tracing the origin of the word "fogon" a common outdoor cooking set up in Puerto Rico, I came across idiophones of the Basque language. Under the alphabetical listing L there is "lelo" - same old story; which compared to the musical form seems right.