Big changes in the world of music management. Just months after a nasty split with longtime manager Troy Carter, Lady Gaga and her new manager, Bobby Campbell, have joined Artist Nation, Live Nation's artist management division. In the days other shift, mega-manager Irving Azoff has signed Gwen Stefani and No Doubt. Both moves were first reported by Billboard. As the absolute power of record labels have declined, the importance of managers has risen. Artists reply on them to put together the varied and constantly shifting pieces of the puzzle that makes a successful and positive career.

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