Johann Georg Roser (c. 1570–1634) was a German composer and music theorist, primarily known for his contributions to the early Baroque and late Renaissance music. Roser is most notable for his work in sacred music, particularly his collections of motets and hymns, which reflect the stylistic transition of the time. His significant works include the collection "Cantiones Sacrae," published in 1620, which features a variety of vocal settings and showcases his ability to blend polyphony with emerging Baroque elements. Roser's compositions are characterized by their intricate counterpoint and expressive melodies, serving as an important link between the Renaissance choral tradition and the more dramatic styles that would follow. Roser's impact on music lies in his role as a bridge between eras, influencing later composers with his innovative approaches to harmony and structure in sacred music. Though not as widely known as contemporaries like Heinrich Schütz, Roser's contributions provide valuable insights into the development of choral music in Germany, making him a notable figure in the history of early music.