Here's a link to the approximately 40 minute video for those that missed it:
The opening song is called Dark Fantasy, produced by RZA, Kanye West and No ID. It's dope as hell. Other songs from the album play during the film too.
Song at the end, Lost in the World:
And before the op gets carried away, during the Q&A parts someone asked about that and Kanye said it wasn't his idea it was the directors or something like that.