Mistress Mary was the stage name of Mary Ainsel, a British pop singer and songwriter who emerged in the late 1960s. Known for her 1969 single “And I Didn’t Want You,” produced by Paul McCartney, Mistress Mary blended gentle folk sensibilities with the experimental edge of the era’s studio pop. Though her discography is small, her singular release has gained enduring appeal among collectors and fans of rare, emotive British pop, preserving her place as a distinctive voice in late‑’60s music history.