In the year 2010 two of us stumbled across Sacred Harp singing on the Internet and fell in love with this music. In 2011 the first German singing group was founded in Bremen. To this day most of our singers are former non-singers who couldn't read music when joining the group. To help them (and ourselves!) get going, we built a website (very similar to this one) with the songs from the Sacred Harp, 1991 Denson edition.
To our surprise this site found considerable resonance worldwide, despite being in German.
In 2013 we sang from the Christian Harmony for the first time. It felt different, and it felt good. We learned that apparently even fewer people sing from this book than from the Sacred Harp.
The motivation for building the Sacred Harp site was to help our local group. The site you are looking at is under construction; we do it to help keep this wonderful music alive.