Johann Sebastian Bach (1685-1750) was a German Baroque composer whose sacred and instrumental works established foundational principles of harmony, counterpoint, and fugal writing that shaped Western music for centuries. His output spanned cantatas, passions, concertos, and keyboard works, all characterized by mathematical precision married to profound emotional depth. For music educators, Bach represents the gold standard of musical architecture: every note serves both structural and expressive purposes, making his works invaluable for teaching voice leading, harmonic function, and the relationship between form and feeling.