Of course it is important to make that strong initial impression, that is first and foremost. Second, having all the music, assisting materials, image, business elements and the presentation of these pieces in place is paramount and required. Third is knowing how to individually and specifically present to the person, company, or agency, and doing it the right way.
This last paragraph represents the gold standard that has been a requirement of the industry for years. The musicians that move forward are those that have all the elements in place. If they don’t, they might want to hold up on their forward motion and get those elements in order.