Sean Rafferty celebrates the centenary of the birth of Kurt Weill and meets composer H.K. Gruber. Music includes at 5.15 Vivaldi's Violin Concerto in D, RV549 performed by Europa Galante directed by Fabio Biondi (violin); at 6.00 Sibelius's Spring Song, Op 16, played by the Gothenburg Symphony Orchestra under Neeme Jarvi; and at 6.50 Chabrier's Overture: Gwendoline performed by the Vienna Philharmonic Orchestra conducted by John Eliot Gardiner.