"Crystal singing" refers to the act of using crystal or glass objects, such as singing bowls or glasses, to produce musical tones or vibrations. Full definition
A great spot to find sacred stone, crystal singing stones, and jewelry. (hbfit.com)
In a consulting suite in New York City, a cancer patient gets her chemotherapy and a quartz crystal singing bowl «treatment» at the same time. (newscientist.com)
Bring on the quartz crystal singing bowls and the iOt California kings, please! (mindbodygreen.com)