David Duchony
De La Soul vs. Parrappa The Rappa : "I Gotta Believe!"
https://www.youtube.com/watch?v=vi8wcm6miHg

-or-
Parma The Rapper Stage 6 (featuring M.C. King Kong Mushi )- I Gotta Bleive
https://www.youtube.com/watch?v=IbYdRZ8FiuA#t=35m

Why? X-files tie in with "I want to believe."


--
Jeff Foxworthy
The Undertones - Smarter Than U
https://www.youtube.com/watch?v=N5afiqamGUo#t=1m10s

Why? Says he there for "Are you smarter than I fifth grader."