From Rolling Stone:
Franklin went AWOL on producer Wexler after she took off from a 1967 recording session at Fame Studios in Muscle Shoals, Alabama, leaving him with an incomplete version of this simmering R&B ballad. A few weeks later, Franklin resurfaced at Atlantic Studios in New York to lay down her lead vocal. The result, as Wexler put it, was “perfection.”
From allmusic, reviewing the album:
Much of the credit is due to producer Jerry Wexler, who finally unleashed the soulful intensity so long kept under wraps during her Columbia tenure; assembling a crack Muscle Shoals backing band along with an abundance of impeccable material, Wexler creates the ideal setting to allow Aretha to ascend to the throne of Queen of Soul, and she responds with the strongest performances of her career.