April 15, 2013
Links invade the title page. 
From A Compendium of Practical Music in Five Parts: Teaching, by a New and Easie Method, 1. The Rudiments of Song. 2. The Principles of Composition. 3. The Use of Discords. 4. The Form of Figurate Descant. 5. The Contrivance of Canon, v. 1, by Christopher Simpson (1667). Original from the Bavarian State Library. Digitized July 1, 2010.

Links invade the title page. 

From A Compendium of Practical Music in Five Parts: Teaching, by a New and Easie Method, 1. The Rudiments of Song. 2. The Principles of Composition. 3. The Use of Discords. 4. The Form of Figurate Descant. 5. The Contrivance of Canon, v. 1, by Christopher Simpson (1667). Original from the Bavarian State Library. Digitized July 1, 2010.

September 28, 2012

Hybrid sheet music and flourishes produced when left folded.

Throughout Walker’s Hibernian Magazine, or, Compendium of Entertaining Knowledge (1786). Original from the New York Public Library. Digitized November 21, 2007.

June 21, 2012

Note: “mind if I look at your, @Playboy@?”

From the title page of Foundation to Flute Playing: An Elementary Method by Ernest F. Wagner (1918). Original from Pennsylvania State University. Digitized March 28, 2012.

May 29, 2012
“Musical notation cropped in such a way that no musical notes remain visible. In addition, this entire book has been digitized in reverse page order, beginning with 357 and proceeding backwards to the beginning to the book. Also, text recognition software incorrectly believes this book to be in Arabic, for some reason.” 
Submitted by Gregory Bloch. 
From The Boston Handel and Haydn Society Collection of Church Music‬: ‪Being a Selection of the Most Approved Psalm and Hymn Tunes, Anthems, Sentences, Chants, &c. : Together with Many Beautiful Extracts from the Works of Haydn, Mozart, Beethoven, and Other Eminent Composers, Harmonized for Three and Four Voices, with a Figured Base for the Organ and Piano Forte‬ (1830). Original from Harvard University. Digitized March 7, 2007.

“Musical notation cropped in such a way that no musical notes remain visible. In addition, this entire book has been digitized in reverse page order, beginning with 357 and proceeding backwards to the beginning to the book. Also, text recognition software incorrectly believes this book to be in Arabic, for some reason.” 

Submitted by Gregory Bloch

From The Boston Handel and Haydn Society Collection of Church Music‬: ‪Being a Selection of the Most Approved Psalm and Hymn Tunes, Anthems, Sentences, Chants, &c. : Together with Many Beautiful Extracts from the Works of Haydn, Mozart, Beethoven, and Other Eminent Composers, Harmonized for Three and Four Voices, with a Figured Base for the Organ and Piano Forte‬ (1830). Original from Harvard University. Digitized March 7, 2007.

March 13, 2012
Paper ephemera held in by employee: “ALL VOCAL SCORES / $5.00”
From the front matter of The Rainbow Girl by Louis Achille Hirsche (1917). Does not include metadata indicating library of origination or date of digitization.

Paper ephemera held in by employee: “ALL VOCAL SCORES / $5.00”

From the front matter of The Rainbow Girl by Louis Achille Hirsche (1917). Does not include metadata indicating library of origination or date of digitization.

September 23, 2011

Printed plates and sheet music left folded through digitization.

From various pages of The Lady’s Magazine or Entertaining Companion for the Fair Sex: Appropriated Solely to their Use and Amusement, v. 9 (1778). [Here]

August 21, 2011

Torn page repaired with (highly acidic) tape; pencil marginalia, multiple filters, distortion.

From p.58-61 of Harmony and Instrumentation: The Principles of Harmony, with Practical Instruction in Arranging Music for Orchestras and Military Bands by Oscar Coon (1883). [Here]