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In page Sex segregation:

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A special case presents with choirs and choruses, especially in the tradition of the choir school which uses ensemble and musical discipline to ground academic discipline. Male and female voices are distinctive both solo and in ensemble, and segregated singing has an evolved and established aesthetic. Male voices, unlike female voices, break in early adolescence, and accommodating this break in an educational program is challenging in a coed environment. Coeducation tends to stigmatize males, as is often the case in expressive arts, unlike athletics.[citation needed]