I can’t find it now, but it reminds me of a similar one that I am pretty sure was genuine based on the reaction of the person filming.

There’s a trend in the UK for putting pianos in railway stations, and a guy was playing along, being filmed by a friend, when half a dozen people walked passed with battered suitcases and joined in, including a couple of violins. Presumably part of an opera company on the way back from a performance.