Input (grade 13): 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.
Output (grade 9): By 1929, he was conducting at the Festspielhaus, Salzburg and in 1934 he led the Vienna Philharmonic for the first time.