Original: The following year , and again in Salzburg , Karajan led the Vienna Philharmonic for the first time , and from 1934 to 1941 , Karajan conducted opera and symphony concerts at the Aachen opera house .
Simplified: By 1929 , he was conducting at the Festspielhaus , Salzburg and in 1934 he led the Vienna Philharmonic for the first time .