| Style | Typical forces | Difficulty | Where to find PDFs | |---|---:|---:|---| | Renaissance polyphony (e.g., Palestrina) | SATB a cappella / small choir | Moderate–Advanced | IMSLP, academic editions | | Classical Mass Sanctus (e.g., Mozart) | Choir + orchestra/organ | Advanced | Publishers (Henle, OUP), libraries | | Romantic/choral (e.g., Duruflé) | Choir + organ/orchestra | Advanced | Publishers (Durand, Boosey) | | Contemporary liturgical | Choir ± organ, optional congregation | Easy–Advanced | Composer sites, modern publishers |
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