A New Analysis of "Kol B'Isha Erva"
There is no prohibition whatsoever of innocent singing; rather, only singing intended for sexual stimulation, or flirtatious singing, is forbidden. Although this distinction is not explicit in the early rabbinic sources, it closely fits the character of the prohibition as described in different contexts in the Talmud and the Rishonim, and it is supported by the language of the Rambam, the Tur, and the Shulchan Arukh.