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.
You don't need any specific education, but it might pay to check out any DJing courses you have available nearby. The main thing you need is good taste in music. Know what the people want. You'll need a good presenting voice, and most of all, you'll need plenty of money to get started.