Here Erb manages to extend the shortest of the psalms, Psalm 117, by rendering it as a canon:
And now Psalm 19:
The congregation also sings the Apostles' Creed:
Are these psalms sung elsewhere, perhaps in other CREC congregations? Further information on this subject would be welcome.
A brief exploration of the CREC reveals that it has a publishing arm, Canon Press, which produces the denomination's liturgical publications. The above psalms are from Worship in Harmony, while the one below is a portion of Psalm 119 from its primary congregational worship book, Cantus Christi. The singing is inspiring.