Some guy apparently wrote a dozen studies in harmonics and some of them are based on traditional hymns. Here's two of them that you can listen to if you're in the mood for a little music for Easter, or in the mood for music written using only harmonics on a single guitar.
Study No.8 in Harmonics
Based on an old tune known to English-speakers as "Come Thou Almighty King"
Study No.9 in Harmonics
Based on the shape-note tune "Wondrous Love"
Wenatchee The Hatchet hopes you're having a pleasant Easter weekend.