Operas:
* Der Zauberer (1800)
* Der Augenarzt (1803)
* Die schöne Müllerin (1806)
* Die Bergknappen (1807)
* Die Verwandlungen (1810)
* Die Kreuzfahrer (1811)
* Die Freischütz (1813)
* Die Brautwahl (1815)
* Die Schweizer Familie (1819)
* Der lustige Schuster (1824)
* Der Vampyr (1828)
* Die Verschwörung (1831)
Other Vocal Works:
* Cantatas
* Mass
* Songs
* Choral works
Instrumental Works:
* Symphonies
* Concertos
* Chamber music
* Piano pieces
* Orchestral works
He also published a book on harmony and several works on music theory.
Important Note:
Seyfried is often confused with another composer, Ignaz von Seyfried (1766-1839), who was also active in Vienna. However, their works are distinct and they should not be confused.
Further information:
To learn more about Seyfried's life and work, you can consult online resources such as Wikipedia or AllMusic, as well as music libraries and archives.