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.
There are no postsecondary education requirements for those interested in performing popular music. Many musicians and singers of classical music and opera have a bachelor's degree in music theory or performance. To be accepted into one of these programs, applicants are typically required to submit recordings or audition in person, and sometimes must do both.