Perhaps you have rubbed your finger around a wine glass and created a tone? There is an entire world and ancient history of “glass music” with a class of instruments called idiophones. These include musical glasses (Verrillon/Seraphine), glass harp, glass armonica, verrophone, etc. (if you are unfamiliar with these, I highly recommend reading some of the links – the entire world is just fascinating). Included are various types of singing bowls – Tibetan singing bowls are typically made of metal, but glass/crystal ones are also used.

An entire renovation of Washington Square arch was recently completed, including the installation of some huge, high intensity ground lights. These create a unique environment for performers at night. I recently saw Wendy and Aaron performing there (using the name Dievolve). The illuminated crystal singing bowls created a beautiful effect.
I have included a video; the first part is of Wendy on the crystal bowls and Aaron on a metal one, and the second part features Aaron playing guitar with an aggressive, angry style with Wendy producing her haunting tones. I thought the combo was quite nice in person – I hope it translates in the video clips I have provided…