Plainsong (neumatic) notation on a four-line staff with Latin text written in Gothic Script. The text is from Psalm 150, Verse 1 and Psalm 123, Verse 7.
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Below are key reference books that provide a general overview of a topic or help identify synonyms, related terms, or basic data. These sources often include references and lists of further readings.
The New Grove Dictionary of Music and Musicians by 
The New Grove Dictionary of Musical Instruments by 
The New Grove Dictionary of Opera by 
The New Grove Dictionary of American Music by 
The Oxford History of Western Music by 
The Piano: An Encyclopedia by 
The Norton-Grove Dictionary of Woman Composers by 
International Encyclopedia of Women Composers by 
Baker's Biographical Dictionary of Musicians by 
Willamette University's Book of Hours (Link to digital copy)
This Flemish Book of Hours, entitled Praeces piae, made in third quarter of the 15th century in the diocese of Tournai, in modern Belgium. The text provides prayers for the eight hours of the day at which prayers were recited (Matins, Lauds, Prime, Terce, Sext, None, Vespers, and Compline).
This list is based off of the Library of Congress Classification Outline.
