Input (grade 12): Joseph Willem Mengelberg (28 March 1871 â "21 March 1951) was a Dutch conductor, famous for his performances of Mahler and Strauss with the Concertgebouw Orchestra.
Output (grade 6): Willem Mengelberg (born Utrecht, 28 March 1871; died Zuort, Switzerland, 22 March 1951) was a Dutch conductor.