Two collections of works by Willkomm have been published in the publishing house Lotter in Augsburg. Both his collections of Arias with the title "Philomela Sacra\" (= \"Sacred Nightingale\") from the years 1730 [RISM W 1217] and 1731 [RISM W 1218] have been probably written for own use in the monsatery of Bildhausen, before they were published. These Arias seem to be rather popular, since there was a second edition of Opus 2 already in the year 1732. Some of these arias have been published by the International Valentin-Rathgeber-Society Oberelsbach e.V. in its own publishing house.