be instrumental ( synonym found)
Definition of be instrumental:

°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"
°(grammar) The instrumental case.
°(music) A composition without lyrics.
Definition of be instrumental:

°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"
°(grammar) The instrumental case.
°(music) A composition without lyrics.
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