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.
In addition to musical skills, music therapists need to possess specific personal traits to be effective in their jobs. A music therapy education program can teach you the basics, but it probably can't provide you with many of the innate skills and qualities that you'll need to interact and relate with your clients.