Frederick Martin "Fritz" Reiner, was a prominent conductor of opera and symphonic music in the twentieth century, conducting is the art of directing a musical performance, such as an orchestral or choral concert, primary duties of the conductor are what?
Fritz Reiner:  Hungarian born and trained, he emigrated to the United States in 1922, where he rose to prominence as a conductor with several orchestras. Conducting:  The primary duties of the conductor are to interpret the score created by a composer in a manner which is reflective of those specific indications within that score, set the tempo, ensure correct entries by various members of the ensemble, and to "shape" the phrasing where appropriate.
to interpret the score created by a composer