The 37-year-old singer and former "The Voice" coach said in the May 5 issue of Billboard that the NBC reality competition is a "churning hamster wheel" focused on "making good TV moments."
"It became something that I didn't feel was what I had signed up for in season one," she explained of her departure.
"You realize it's not about music. It's about making good TV moments and massaging a story."
Aguilera served as a coach in Seasons 1, 2, 3, 5, 8 and 10 of "The Voice," and said the series became an "energy sucker" in her life.
"I was longing for freedom," the star said before recounting her post-show routine.
"I would just take everything off -- the makeup, all of it -- and would blast hip-hop, or Nirvana, 'Creep,' Slayer," she shared. "Anything like that to get me out of that zone, that TV mode."
Aguilera is instead focused on her eighth studio album, Liberation, which debuts June 15. She released the single "Accelerate" featuring Ty Dolla $ign and 2 Chainz and a music video for the song Thursday.
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