Benson, Louis F., Studies of Familiar Hymns. Series I and II. Westminster Press, 1903 and 1923.
An authoritative study. One of the best.
Breed, David R., The History and Use of Hymns and Hymn-Tunes. Revell, 1903.
Useful but somewhat out of date, especially in its classification of hymns.
Brown, Theron, and Butterworth, Hezekiah, The Story of the Hymns and Tunes. American Tract Society, 1906.
Based on Butterworth’s Story of the Hymns and Story of the Tunes, with much added material.
Gillman, Frederick John, The Evolution of the English Hymn. Macmillan, 1927.
Well written. Resembles Horder’s Hymn Lover but brings the material more nearly up to date.
Horder, W. Garrett, The Hymn Lover. Curwen, 1889.
An excellent introduction to Christian hymnology.