Does folk exist? This is a bit like asking, does "dark matter" exist. Without unobservable dark matter, current theory suggests that galaxies have insufficient mass to curl up as tightly as they do - they'd spin out. Similarly, I went to a folk festival last weekend, and although some persons, unnamed, would suggest I did not actually encounter any folk, it must have been present there somewhere, or the festival would not exist.

Last night, I watched a show about the Large Hadron Collider. What a machine! I'm pretty sure its purpose is to demonstrate the existence of the elusive FOLK, the last unobserved music among those predicted by the Standard Model. Now that's 3 billion Euros well spent!