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.
Certification is not required to become a professional songwriter. However, some colleges and universities offer certificate programs to help songwriters hone their skills. For example, the prestigious Berklee College of Music offers an online singer-songwriter professional certificate course.