The Liber usualis is a valuable resource for musical scholars; as a compendium of the most common chants used by the Catholic Church, it is particularly useful for identifying the origins of chants used in polyphonic compositions.
Using Optical Music Recognition and Optical Text Recognition, Search the Liber usualis presents a scanned, searchable version of this important resource. Published by the Distributed Digital Music Archives & Libraries Lab and sponsored by the Single Interface for Music Score Searching and Analysis (SIMSSA), this is a proof-of-concept demonstration for the larger task of providing search capabilities for all digitized musical works.
Below, a Palm Sunday antiphon with scrolling notation.
Jordan Randall Smith 