Naturally, agile methodology is applicable in any task based, intellectual pipeline. It is widely used in Movie industry and Gaming industry (even in the design part)....
Yes - If you are creating things as part of a team, agile is applicable. Before the methods came values and principles via the agile manifesto (agilemanifesto.org). The methods grew out of identifying ways to do work whilst living the values and principles.
I wrote a book on this topic. https://www.amazon.com/Agile-Performance-Improvement-Synergy-Technology/dp/1484208935