 The official language of Arlesheim is (the Swiss variety of Standard) German, while the main spoken language is the local variant of the Alemannic Swiss German dialect.The cathedral has a Baroque organ built by the German builder Johann Andreas Silbermann, based in Alsace, in 1761.The instrument was restored by Metzler in 1959–1962, and is an example of the fusion of French and German organ building styles.