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Gregorian chant was traditionally sung by [[choir]]s of men and boys in churches, or by women or men of [[religious ordermonastics]]s in their [[chapel]]s, and is commonly heard in celebrations of the [[Tridentine MassWestern Rite]] by those Catholics who follow the 1962 MissalLiturgies. It is the music of the [[Roman Rite]], performed in the [[Mass (liturgy)|Mass]] and the monastic [[Canonical hours|Office]]. Although Gregorian chant supplanted or marginalized the [[Latin liturgical rites|other indigenous plainchant traditions]] of the Christian West, [[Ambrosian chant]] still continues in use in Milan, and there are musicologists exploring both that and the [[Mozarabic chant]] of Christian Spain. The Roman Catholic Church still officially considers Gregorian chant the music most suitable for worship in the [[Roman Rite]].<ref name=Catholic>[http://www.christusrex.org/www1/CDHN/v8.html The Constitution on the Sacred Liturgy, Second Vatican Council]. This view is held at the highest levels, including [[Pope Benedict XVI]]: [http://www.cwnews.com/news/viewstory.cfm?recnum=44963 Catholic World News 28&nbsp;June&nbsp;2006] both accessed 5&nbsp;July&nbsp;2006</ref> During the late 20th century, Gregorian chant underwent a musicological and popular resurgence both within and outside the Roman Catholic Church.