Stainer & Bell: Hymns - Biographies and bibliographies of contemporary hymnwriters. - http://www.stainer.co.uk/hymns.html
Evangelical Church Music - Brief biographies of early composers of hymn tunes from the Here of a Sunday Morning radio program. - http://www.hoasm.org/IVC/IVCEvangChurchMusic.html
German Hymn-Writers of the 1600s - Brief biographies of Philipp Nicolai, Johann Heermann, Paul Gerhardt, and Joachim Neander. - http://elvis.rowan.edu/~kilroy/JEK/10/24.html
Hymn Writers of the Church - Brief biographies of ~300 authors included in the 1905 Methodist Hymnal. - http://ccel.org/n/nutter/hymnwriters/