Seyfried Ignaz Xaver Ritter von (1776 - 1841)
Compositor Austriaco del mismo Viena
Bio
http://es.wikipedia.org/wiki/Ignaz_von_Seyfried
http://en.wikipedia.org/wiki/Ignaz_von_Seyfried
http://www.britannica.com/eb/article-9067009/Ignaz-Xaver-Ritter-von-Seyfried
http://www.requiemsurvey.org/composers.php?id=720
Es autor de

2 Requiems
Que se sepa
Tambien tiene un

Libera
Compuesto en 1827 a la memoria de Ludwig van Beethoven

Seyfried's church music, widely known and partly printed, included many masses and requiems, motets, offertories, graduals, a Libera for men's voices composed for the funeral of Ludwig van Beethoven (1770-1827).