The Prazak Quartet is in town, playing for the San Antonio Chamber Music Society and performing in schools as outreach.
They stopped by the Texas Public Radio studios to talk with John Clare (seen right with the quartet) and performed in the studio as well!
Here they show why Haydn's Opus 50 is called the "Frog" - listen and watch the first violinist who plays the same note on two different strings (he's on the left hand side of the screen.)
They think Haydn wrote this to amuse his audience, including the Prince and Emperor! You can also see the Prazak's play a movement of Haydn here.