Here are a number of great resources for searching for anything related to Hymn Texts – words, tunes, meters, etc.
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Advent and Christmas:
Cyberhymnal – Advent | Christmas
Hymnary – Advent | Christmas
Oremus Hymnal – Advent | Christmas
Sacred Harp – Christmas
Hymns Ancient and Modern – Advent | Christmas
Charles Wesley – Nativity Hymns (PDF)
Hymns and Carols of Christmas (Exhaustive list!)
Advent and Christmas Music @ Cardiphonia
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WEB:
Isaac Watts – Psalms and Hymns
Olney Hymns (Newton & Cowper)
Hymns of Charles and John Wesley (Methodist)
Gadsby’s Hymnal (Baptist)
Hymns Ancient and Modern (Anglican)
PDF:
Trinity Hymnal (blue version)
Spurgeon’s “Our Own Hymn Book”
http://books.google.com/books?id=V98TAAAAYAAJ&ots=f8yl4hh_BS&dq=spurgeon%20our%20own%20hymn%20book&pg=PP7#v=onepage&q&f=false
Thanks Rich! forgot that one.