Watch the opening credits of the 1956 movie Rock Rock Rock.
Then, visit the Internet Archive (http://archive.org) and find some other where you can find over a million videos and other multimodal texts, most of which are available for download, remix, and reuse. Browse through some of the genres to see how credits have been designed historically. How are the credits for Rock Rock Rock effective for its genre and rhetorical situation? How will the credits for your piece be different?