Philipp Klais, co-organizzatore della giornata, fa visitare la sua casa organaria in Bonn. [Foto Sylviane Falcinelli]

Philipp Klais, co-organisateur de la journée, faisant visiter sa manufacture d'orgues à Bonn [Photo Sylviane Falcinelli]

Philipp Klais, who helped with the organisation of the event, shows his organ-building factory in Bonn [Photo Sylviane Falcinelli]