Kantaatin
Kantaatin is not a widely used standalone subject in music reference works. In Finnish, kantaatin is the genitive form of kantaatto, the word for cantata. It appears in phrases that refer to a cantata, such as describing its text, composer, or other attributes. There is no distinct article or entry for Kantaatin as an independent topic; its meaning depends on the surrounding context in Finnish sentences.
A cantata is a vocal‑instrumental musical form that originated in 17th‑century Italy and became a major component
In Finnish usage, kantaatto is the term for the cantata, and kantaatin functions as the possessive/genitive