J.S. Bach’s 'Leipzig' chorale preludes include some of his most intensely beautiful works for organ as well as some of the most challenging for the performer to interpret. While these eighteen chorale preludes have received much scholarly attention, they continue to inspire new ideas. The late Anne Leahy’s monograph explores their liturgical purpose and theological meaning in the context of Bach’s Lutheran world. Leahy bases her observations on the chorale texts, detailed analysis of the music, and writings by Luther and his followers. Her analysis includes discussion of other music by Bach, mostly vocal works with similar subjects and approaches to setting the text. As background, she highlights commentary from other Bach scholars from Spitta forward. Leahy’s comprehensive approach adds another resource for the organist to enrich performance. ... The book. . . serves as a valuable resource for the organist and student of Bach. . . . Leahy’s observations are thoughtful and often original.