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.
Composers typically do the following: 1  Write original music that orchestras, bands, and other musical groups perform. 2  Arrange existing music into new compositions. 3  Write lyrics for music or work with a lyricist. 4  Meet with companies, orchestras, or other musical groups that are interested in commissioning a piece of music.