He was also director of a musical society in Koblenz and director of the popular choir of Munich. In 1929, he premiered Arnold Schoenberg's choral work Glück Op. 35, No. 4.
In 1933, he emigrated from Germany due to the Nazi regime and after that worked as a music teacher in Kenninghall, England. After the war, he headed the Györ Conservatory of Music. He became interested in Béla Bartók's music there.
Lendvai wrote one opera, Elga (1916, to a libretto by Gerhart Hauptmann), the festival music Völkerfreiheit (1930), a symphony, Archaic dances, Scherzo for orchestra, 3 Pieces for organ Op. 4, chamber music, choral works and songs. Lendvai's choral music influenced many other choral composers.
Gesine Schröder, Zum Streit der Männerchöre in den Zwanziger Jahren: Eine Erinnerung an Erwin Lendvai, in: 4. Tagung AIM Gender in Stuttgart-Hohenheim, 2.-4.2.2006. PDF(in German).