Acting as an instrument; serving as a means; contributing to promote; conductive; helpful; serviceable; as, he was instrumental in conducting the business.
Pertaining to, made by, or prepared for, an instrument, esp. a musical instrument; as, instrumental music, distinguished from vocal music.
Applied to a case expressing means or agency; as, the instrumental case. This is found in Sanskrit as a separate case, but in Greek it was merged into the dative, and in Latin into the ablative. In Old English it was a separate case, but has disappeared, leaving only a few anomalous forms.
Doing the instrumental thing, you're really looking for the power of the melody to carry the record. Michael W. Smith
I had my first 'Survivor Series' in 1991 and I was fortunate enough to be an instrumental part of the shows I was on. Ric Flair
In chess one cannot control everything. Sometimes a game takes an unexpected turn, in which beauty begins to emerge. Both players are always instrumental in this. Vladimir Kramnik
Righteousness and faith certainly are instrumental in healing the sick, deaf, or lame - if such healing accomplishes God's purposes and is in accordance with His will. Thus, even with strong faith, many mountains will not be moved. And not all of the sick and infirm will be healed. David A. Bednar
I grew up in Ohio, where civil-rights accomplishments had already begun to accelerate before Martin Luther King appeared. In hindsight, we know that many people, black and white, were instrumental in changing the Jim Crow status quo on all levels. Rita Dove