instrumental
adjective
°Acting as an instrument; serving as a means; contributing to promote; conductive; helpful; serviceable; essential or central.
"He was instrumental in conducting the business."
°(music) Pertaining to, made by, or prepared for, an instrument, especially a musical instrument; as, instrumental music, distinguished from vocal music.
"He defended the use of instrumental music in public worship. — Thomas Babington Macaulay"
noun
°(grammar) The instrumental case.
°(music) A composition without lyrics.