Classic Arts Showcase is a 24 hour streaming
visual performance art channel also carried by numerous television affiliates. I grew up watching it on the local city university channel (Cunytv) during the wee hours of the morning but never knew it streamed perpetually til today. Not sure who provides the funding.
Wiki entry.
The clips mostly feature European/American classical works and/or pieces taken from longer works, normally no longer than 5 to 10 minutes long with, as you might expect, a generous amount of Christmas related content now.