Chart datum, level of water depth on a nautical chart. Datum or datum point, a (possibly arbitrary) reference baseline or point from which scientific measurements are made (from a Latin meaning of datum as a given, i.e. an accepted fact)
Music directors and composers must guide musicians and singers by preparing musical arrangements and helping them achieve the best possible sound. Musical talent. To become a music director or composer, one must have musical talent.
What Music Directors and Composers Do Music directors, also called conductors, lead orchestras and other musical groups during performances and recording sessions. Composers write and arrange original music in a variety of musical styles.