"production" is not defined, but producer is:

This indicates an artist who is responsible for the creative and practical day-to-day aspects involved with making a musical recording.

The entire "production" tree could use some refactoring IMO, but simply moving "misc" into a separate grouping would be an improvement IMO.

• production
  • producer
  • engineer
    • ...
  • misc
    • legal representation - not production?
    • phonographic copyright - not production?
    • booking - not production?
    • artists and repertoire - not production?
    • creative direction - not production? and audio director is classified under performance.
    • art direction - not production?
    • design/illustration - not production?
    • graphic design - not production?
    • photography - not production?
    • instrument technician - not production?
    • publishing - not production?