The Philadelphia-based period-instrument ensemble Night Music re-creates an afternoon of music making in 1801 at the Palais Arnstein in Vienna. The program includes a flamboyant Quintet for flute and strings by Joseph Kraus, a duo by Carl Ditters von Dittersdorf for the unusual combination of viola and double bass, and a chamber arrangement – by the impresario Johann Peter Salomon in the same instrumentation as the Kraus Quintet – of Haydn’s Symphony No. 94, with its most notorious of musical surprises!