Distinct communities carry their own nusach traditions built up over centuries in different regions, so that Ashkenazi, Sephardi and various Mizrahi communities, including distinct traditions among Yemenite, Syrian, Iraqi and other Middle Eastern and North African Jewish communities, each recognize a different melodic bank for what is, in terms of the underlying liturgical text, largely the same set of prayers.
Nusach Ashkenaz and Nusach Sefard, despite the similar naming, both developed within Ashkenazi communities and differ from each other in the arrangement and wording of certain prayers as much as in melody, a reminder that nusach is used both for a community's melodic tradition and, confusingly, for its liturgical rite more broadly. Because nusach is transmitted orally through hearing and imitation rather than through musical notation, a prayer leader trained in one community's tradition can find another community's nusach genuinely unfamiliar even when praying from a text that looks identical on the page, and the melodic tradition a hazzan or lay prayer leader is trained in is often treated as a marker of communal identity and continuity in its own right, one reason modern movements that developed their own liturgical adaptations, including Reform and Conservative Judaism, also developed their own distinct musical settings and approaches to nusach alongside their textual changes.