Q:

What is the instrument played on the holodeck in Paris?

In Star Trek: TNG, S1 E23 "We'll Always Have Paris", there is a man on the holodeck who appears to be slowly fondling some glass tubes in such a way as to produce music. What is this bizarre instrument being played in the Paris simulation? Does it have a name in-universe, or has it appeared elsewhere?

A:

Memory Alpha simply calls it the Café des Artistes instrument. It apparently never appeared in any other episodes.
None of the instruments listed on Memory Beta appear to be the same instrument.

