Earlier this year, Vox's Estelle Caswell and hip-hop analyst Martin Connor collaborated to explore the evolution of rap rhyme schemes in a must-watch mini documentary. Now, they're back with a new clip that follows a similar style, but this time they have their sights set on Kanye West's innovative approach to vocals throughout his career.

The clip outlines the many eras of Kanye vocals—including rapping through a wire, "chipmunk vocals," auto-tune, and the wizardry that went down on "Ultralight Beam." Caswell and Connor conclude that West's music "orbits around the power and flexibility of the human voice" and calls his use of vocals "the ultimate instrument." Do you agree? Watch above.