The move marks a return to UMGN for Harris, who left in September.
Mabe assumed the CEO/chair role in April 2023.
The first release on the revered label is Ringo Starr's country set Look Up.
Capitol Comedy Nashville will release Bargatze's "Hello, World" on Friday (Sept. 15).
Also this week: Milk & Honey appoints a head of Milk & Honey South, Ganaa's former CEO joins Condé Nast and more.
Christian rises to executive vp of marketing and Femia rises to executive vp of business & legal affairs amid a broader restructuring at the label group.
The move becomes official one day after current chairman/CEO Mike Dungan retires.