Composers of classical music have often made use of <answer>folk music</answer> (music created by musicians who are commonly not classically trained, often from a purely oral tradition). Some composers, like Dvořák and Smetana, have used folk themes to impart a nationalist flavor to their work, while others like Bartók have used specific themes lifted whole from their folk-music origins.
What music comes from those commonly trained by oral tradition?
folk music