Folk and Gospel singing

Folk noun - One of the segments of society into which people are grouped.

Gospel singing and folk are semantically related. In some cases you can replace phrase "Gospel singing" with "Folk", this terms are similar.

Gospel singing noun - Folk music consisting of a genre of a cappella music originating with Black slaves in the United States and featuring call and response; influential on the development of other genres of popular music (especially soul).

Folk and gospel singing are semantically related. You can use "Folk" instead a noun phrase "Gospel singing".