folk music

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Music originating among the common people of a nation or region and spread about or passed down orally, often with considerable variation.
• noun Contemporary music in the style of traditional folk music.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun any genre of music originating from the ethnic community of a specific region; often not recorded, but passed down orally
• noun contemporary music in the style of traditional folk music

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the traditional and typically anonymous music that is an expression of the life of people in a community