The finale of Mozart’s String Quartet No. 14, K. 387, the first of the quartets he dedicated to Haydn. Mozart is having some fun in this, juxtaposing the simplest, lightest folk(-like) music with very learned counterpoint (including a double fugue at one point), showing off his range, as it were. I’m not crazy for the bathroom acoustic of the recording, but otherwise these guys are pretty good.
The world’s oldest string quartet, well over two hundred years old, they apparently have been performing continuously since the time when Beethoven was yet to create half of his string quartets – these guys look remarkably young for such advanced age! And, amazingly, can still play quite well too.