Composers of classical music have often made use of folk music (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.
Is there an answer to this question (If it cannot be answered, say "unanswerable"): Folk musicians are not commonly what?
classically trained