Various - folk songs - Folk Songs (Berio) - Wikipedia

Though these songs do in fact incorporate elements that are  indigenous to American folk music , there is a difference between the folk songs of popular music and the folk songs created by folk singers. Usually, this difference is in the relationship between the artist and audience, and the motivation behind singing the song. Many folksingers would agree that when a song is sung primarily for profit and the popularity of the artist, it is pop music. Whereas when it is a song that rises out of the need of the artist or community and is sung to inform or incite an audience to action — whether that action is deep thought, joining in the singing or social action — it is generally thought of as folk music. There are, of course, many blurred lines between those two motivations, which explains the amount of confusion and disagreement among music fans, critics and others regarding what exactly "folk music" is. 

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