Folk

Folk can mean:

 a specific people, tribe, or nation
 folklore, stories and traditions told orally.
 folk art, art done in traditional styles

In music:
 folk music or folksong, music by and of the common people.
 folk dance, a 19th century form of dance
 folk-punk, a genre of music that combines elements of folk and punk rock music
 folk-rock, a kind of music that is folk music and Rock and Roll mixed together.
 folk metal, a sub-genre of heavy metal that mixes it with folk music