"Selling Songs of Leyte"

I was channel surfing last week when I happened to pass by a channel featuring an award winning documentary done by Eli Africa. What struck my chord about this film was that it was titled, " Selling Songs of Leyte". Having lived in this island for practically all my life I never knew that there existed such a thing as a "selling song"!
Bulad(dried fish) vendors from Dulag and Tanauan and another neighboring municipality were featured. Tita said that when they were young there were indeed bulad vendors who would sing while counting their bulads!Interesting indeed and I want to witness this for myself.
Tabo's(market day) anyone?