I'd put that kind of contribution on about the same level as the conductor for an orchestra or the director for a movie or play. The same piece of music played

I'd put that kind of contribution on about the same level as the conductor for an orchestra or the director for a movie or play. The same piece of music played by the same musicians can have noticeable differences depending on the conductor. Similarly, choosing a different director can have a noticeable impact on a movie or play despite having the same script and cast.