The show's theme song called "Ride on the Magic School Bus" was written by Peter Lurye and performed by rock' n' roll legend Little Richard.

Who sings the original magic school bus theme song? OK. Let's think. My stream of consciousness:
The relevant information to answer the above question is: The show's theme song called "Ride on the Magic School Bus" was written by Peter Lurye and performed by rock' n' roll legend Little Richard. The answer is Little Richard.