According to Berry Gordy, Motown routinely recorded without a singer present, in violation of union rules: “We were recording sometimes tracks without the singer, and according to the Union, you had to have a singer singing it live. You couldn’t do tracks in those days.” A union representative made a surprise visit, and Berry said, “Everybody went crazy, saying, ‘Well, you’re doing a session in there and the union guy is coming.’ We told Mickey, ‘Man, we’ve got to put somebody on the mic.’ His secretary overheard it….Then she grabbed the mic and started singing it, and she was Martha.” – WIKIPEDIA