The New Grove Dictionary of Music and Musicians - Grove's Dictionary of Music and Musicians

The second edition (Grove II), in five volumes, was edited by Fuller Maitland and published from 1904 to 1910, this time as Grove's Dictionary of Music and Musicians. The individual volumes of the second edition were reprinted many times. An American Supplement edited by Waldo Selden Pratt and Charles N. Boyd was added in 1920. This edition removed the first edition's beginning date of 1450, though important earlier composers and theorists are still missing from this edition. These volumes are also now freely available online.

The third edition (Grove III), also in five volumes, was an extensive revision of the 2nd edition; it was edited by H. C. Colles and published in 1927.

The fourth edition (Grove IV), also edited by Colles, was published in 1940 in five volumes (a reprint of the third edition, with some corrections). In addition to the American Supplement, MacMillan also published (in New York and London) a Supplementary Volume edited by Colles.

The fifth edition (Grove V), in nine volumes, was edited by Eric Blom and published in 1954. This was the most thoroughgoing revision of the work since its inception, with many articles rewritten in a more modern style and a large number of entirely new articles. Many of the articles were written by Blom personally, or translated by him. An additional Supplementary Volume, prepared for the most part by Eric Blom, followed in 1961. Blom died in 1959, and the Supplementary Volume was completed by Denis Stevens. The fifth edition was reprinted in 1966, 1968, 1970, 1973, and 1975.