Elanin singer stone

From Memory Alpha, the free Star Trek reference

An Elanin singer stone is a little stone that emits sounds when it is touched by a living being. It is said that it sings a different song for every person.

The Dreman girl Sarjenka was especially fond of the singing stone.

After her planet was saved and her memory of the encounter with the crew of the USS Enterprise-D was erased, Data gave an Elanin singer stone as a present to Sarjenka. (TNG: "Pen Pals")