An orchestra is defined as a large instrumental ensemble typical of classical music. An orchestra features bass, brass, strings, woodwinds, and percussions. In the list given above, the section that is not one of the four groups in the orchestral palette is the voices. The answer would be "voices".
The Music Industry is containing and composing of not only companies but also individuals that making money by writing new pieces of songs, selling live shows and concerts, audio and video recordings and compositions of sheet music. These people called songwriters and composers, musicians, recorders, bandleaders, publishers, and producers, and etc.
But the companies that will be going to create, produce and distribute its musical scores are the Music Publishing companies.
You could draw a picture through God's eyes of him creating the earth. You could show him with clay on the table and tools to the side. Do you get the art in that? Because when some sees it, it will look like farm work, but something came out beautiful.