Sacred (or religious) music
Not really “popular” music. Contemporary Christian versions of the hymns or sacred music, however, would be considered “popular.”
Call and response
Celtic (or Irish)
West African Music
These styles represent other countries and/or were never considered “popular” in this country, although they may have had influence on other styles.
Grand Ole Opry
Tin Pan Alley
These are places or events, not styles, although I will accept “Broadway” as describing Music Theater (but not both).
Any type of folk song that was never sold is not, by our definition, “popular.” Folk music that has been profitable, such as folk revival, would be.
These are groups of musicians and can play or sing many different styles.
These are styles or performers within the realm of “classical” music, or from times outside the time frame of popular music as we define it.
Duple (or triple meter songs)
12-bar blues form
These are compositional or performance types used in many styles.
Seasonal (Christmas, Holiday)
These groups are too broad and can contain many different styles.
Names or titles (performers, composers, or songs)
Names of specific performers, composers, or songs are not considered “styles”