In the five years I served as Director of Animation at Flocabulary, I directed over 200 educational music videos. Here are a handful.  
Maya Angelou

Directed by Drew Roberts
Illustrated by Daniel Fishel
Animated by Kenéz Vetési-Szabados

Types of Triangles

Directed and Animated by Drew Roberts
DP, and Starring: Christopher Camp

Plagiarism

Directed by Drew Roberts
Illustrated by Marko Janev
Animated by Kenéz Vetési-Szabados

The Alamo

Directed, Edited and Animated by Drew Roberts
Cinematographer: Christopher Camp
Inspired by Sunset by Cento Lodigiani

MLK

Directed by Drew Roberts
Animated by Kenéz Vetési-Szabados and Drew Roberts

Taxes

Directed, Edited and Animated by Drew Roberts
Illustration: Jeannie Phan
Frame by Frame Animation: Madeleine Welsch
Cinematographer: Christopher Camp

Skeletal System

Directed and Animated by Drew Roberts
Illustration: Madeleine Welsch

Dinosaurs

Directed by Drew Roberts
Illustrated by Barry Bruner
Animated by Kenéz Vetési-Szabados and Drew Roberts

Sacagawea

Characters Illustrated by Jungyoun Kim
Background Illustrations by Jake Giddens
Animated by Kiron Hussain
Directed by Drew Roberts

Colonial America

Directed by Drew Roberts
Illustrated by Laura Birdsall
Animated by Kiron Hussain

Simple Machines

Directed, Animated & Edited by Drew Roberts
Illustrated by Eleni Mutafopulos