Original: He held positions as a rehearsal accompanist and chorus master at the Théâtre Lyrique , second chorus master at the Paris Opéra , ( 1864 ) , and as organist at Saint-Pierre-de-Chaillot between 1865 and 1871 .
Simplified: In 1864 he became chorus master at the Opéra where he coached the chorus to sing many famous operas .