What a delightful question. I've found myself musing along the same lines, though not in regards to music. That is, back home I have proven myself time and time again as the world's greatest detective. However, all the cases I have solved in the past have become irrelevant here, as there is no evidence to support the truth behind my tales. Official documents are easily fabricated as well. How, then, do we prove that we are professionals? The answer is simple; through actions.