The product is a set of two trade paperbacks titled "Figured Bass Accompaniment" by Peter Williams, published by Edinburgh University Press in 1970, and reprinted in 1977. These workbooks focus on classical music theory and are written in English. The set provides instructions on how to accompany music using figured bass, making it a valuable resource for musicians looking to deepen their understanding of music theory and performance techniques. The 1977 editions are rarer than the 1987 reprints, making them more valuable for collectors. Both are in generally good condition and have the previous owners name printed on the inside covers. Volume 2 has tabs for ease of page turning.