George Michael's onstage charisma and behind-the-boards dexterity paved the way for many artists who wanted the freedom to pursue their pop dreams, whatever shape they might take. While auteurs like Terence Trent D'Arby and Miguel channeled Michael's soulful spirit in their songwriting and production, the Spice Girls transformed the go-go of Michael's former duo, Wham!, into their own zig-a-zig-ahh.