In sports they are called a coach, in movies they are called a director and in music they are called a producer.
“The music producer is a project manager, someone who helps arrange the session, for example where to record that will get the most from the artist. The record producer also is the person that helps the band or artist to realise their vision but also brings a perspective and experienced ear to the session. Most people would agree that a great producer takes the ingredients (the song, the band etc) and makes the record greater than the sum of its parts.”
More info coming later but for now heres a good article of what a music producers does.