I love this sound. During Summerfest in New Bedford, Massachusetts, the Sunday concerts are preceded by a Sacred Harp Sing for those who choose to participate. There is are also monthly Sacred Harp Sings in some communities. The closest one for me is in Providence, Rhode Island. One of the interesting things is that the music is divided into four-part harmony, but some people can sing a part an octave higher or lower than it is written, so the resulting harmony is more than four parts.