Magrew will focus on new venue development, event marketing, strategic partnerships, ticket inventory management and more in his new role.
"It's like the Robinhood of talent," comments Martini, "and it's game-changing."
Greenwald will continue to run Atlantic Records alongside Craig Kallman.
Also this week: Atlantic names an SVP of film/TV and video game synch, a recently-departed Republic A&R sets up a JV with Warner Records and more.
The longtime executive will oversee global business development and international marketing initiatives for the entire roster.
Gruger's promotion follows up two other recent promotions of his colleagues in the past week, indicating a shakeup in leadership at the ByteDance-owned company.