Always, in every area, not just the arts. If a neurosurgeon can describe exactly how to operate on your brain, and yet has never done this, how does he compare with the surgeon who stutters and stammers around trying to describe the procedure, but has successfully performed it hundreds of times?\nI'm sure you can carry this example out in an million occupations if you think about it...in knowing how to do something, language is just not that central to the issue.