Watch: Kesha Releases Video for Emotional Ballad 'Rainbow'

Kesha is back. And 'Rainbow' was worth the wait. That's the consensus about Kesha's first album since 2012, out Friday on Kemosabe Records/RCA Records.

In a four-star review, Rolling Stone calls 'Rainbow' "the best music of her career," while Entertainment Weekly gives the album an A- and proclaims it "an artistic triumph."

Billboard describes lead single "Praying" as a "ballad that tears at your soul" while Consequence of Sound says "no other song in recent memory so perfectly embodies the way in which hope itself is a kind of triumph."

Other reviewers have highlighted songs including "Hymn," a "powerful outsider anthem" (Rolling Stone); the "feminist battle cry" (Mic) of "Woman"; "Hunt You Down," which PopCrush describes as "far more authentic than anything currently playing on country radio"; and "Learn to Let Go," "the most carefree, uplifting song we've heard from her" (Jezebel).