Sparse annotations, though. The Cyber Hymnal . Hymn texts and MIDI files, together on one page. Listed by title. There are also indexes for special topics.
Some pages offer the option of reading a brief biography of the composer.
Nigel Day, Hymns . Historical background on texts and tunes of selected hymns. The Exsultet . Text and RealAudio file, both in English. Hymn texts only, in German and English, from one of the great Lutheran hymnwriters.