In the entry under the tab ERAS titled March on Washington, D.C., I am the author of the entry and I have the original documents used in that entry. Please let me know what you need.
Whoop That Trick (feat. yo gotti, sir vince & dj trick) by Al Kapone Listen ad-free with YouTube Red
Ry Cooder indeed performed most of the other songs during the movie (but not all), including Ralph's part from the Head Cutting Duel, but Eugene's Trick bag was performed entirely by Steve Vai. By the way, current coaching entry in the trivia appears to be inaccurate.