He is best known as the author of a stage music for the version of the Oberammergau Passion Play by Father Othmar Weis [de].
[2] Subsequently, he began the obligatory basic studies (philosophy) at the affiliated Lyceum, but then returned to Rottenbuch to work as chamber scribe of the prelate.
Dedler died on 17 October 1822 at age 43 due to a lung disease in Oberföhring, where his brother was a pastor, and was buried there at the cemetery of St. Lorenz.
Dedler's main work is the stage music composed in 1810 for the Oberammergau Passions Play, for which the Ettal Benedictine priest Othmar Weis had written a new text version after the prohibition of the performance in 1810.
The stage music contains an overture, arias, duets and choirs and shows influences of Joseph Haydn and Wolfgang Amadeus Mozart especially in the orchestration.