Credits tell us who contributed what to the performance. Even people who contributed but not as professionals may be thanked for it. The performers getting the ovation at the end are the tip of the iceberg, but there’s a lot of other work involved in a performance that would go unrecognized without credits. It is impossible to do something completely on one’s own. We use many things that were invented by others, do things that we learnt from others… Even our life was given to us by others! This doesn’t subtract any value from what we accomplish. On the other hand, it adds a very pleasant feeling of being supported by all those who contributed something and without whom our achievement wouldn’t have been possible.