Johann Sebastian Bach is widely known as the “Father of Classical Music." Today, his compositions are held in the highest esteem by musicians in many different disciplines. During his lifetime, however, he was recognized more as a great teacher, diligent church musician and virtuoso of the organ and harpsichord. Following his death in 1750, his music lay largely forgotten until its revival with the St. Matthew Passion under Mendelssohn in 1829. My presentation will focus on J.S Bach's Art of the Fugue, his greatest composition in that genre. Written during the final decade of his life, this magnum opus consists of fourteen fugues and four canons, the fourteenth fugue being left unfinished due to his death. Each of the pieces constitutes a variation on a twelve-note fugal subject introduced in the first fugue. Bach develops this subject using various contrapuntal techniques such as augmentation, diminution, inversion, and mirroring. The first four fugues are “simple" fugues, with each entry of the subject clearly delineated. The next three are “stretto" fugues, where the subjects overlap each other. The next four are “double or triple" fugues, meaning two or three subjects are presented and developed contrapuntally. The next two fugues are “mirror" fugues, where the same subject appears twice, the second time in inversion. The last fugue, left unfinished, would have been a quadruple fugue, something unheard of in his output up to that point. I will perform Contrapunctus I,VII, and XI to highlight the different types of fugues mentioned above.