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.
A lot of artists become their own producers. A composer is a person who creates music through musical notation and interpret the music and give it to the musician. Composers are also songwriters who blend music in with the songs. Composers are people who know music more than the producer and can decipher and translate music through using the instrument. A composer is a multitalented they play more than one instrument and are more the scientists behind the music. Composer makes and creates the music. Music producer manipulates and rearranges the music the composer creates.