The changing of the guard is continuing at Warner Music Group, as Warner Bros. Records prexy-COO Livia Tortella is ankling the company.

A WMG source confirmed Tortella’s exit, which comes six months after the departure of her onetime WBR co-president and CEO Todd Moscowitz.

Moscowitz’s December exit was announced concurrently with Warner/Chappell Music chairman-CEO Cameron Strang’s ascension as head of West Coast operations at No replacement for either Tortella or Moscowitz has yet been announced. WBR chairman Rob Cavallo remains in place.

Strang now enjoys increased executive clout at WMG, where he has added duties since WMG recorded music chairman Lyor Cohen left the company in September. He took charge of the newly-minted publishing and catalog division of the restructured firm in November.

Both Tortella and Moscowitz had enjoyed a close professional relationship with In September 2010, after holding top posts at Atlantic and Asylum Records, respectively, they were promoted to co-president in an overhaul of WBR that saw the simultaneous departure of the label’s chairman-CEO Tom Whalley. Cavallo, previously chief creative officer at WBR, was named chairman at the same time.

However, Cohen and his associates have all hit the door since the acquisition of WMG by Access Industries in 2011 and the subsequent installation of Stephen Cooper as WMG CEO by Access owner Len Blavatnik.