The music collection includes a variety of types of scores. There are two broad categories:
Study scores can include a wide variety of score formats and editions, including miniature scores, scholarly editions, collected works, and even manuscripts. Study scores support musicological research, music analysis, and composition but, in some cases, can also be used in performance settings.
Performance scores can include full scores, conductor's scores, piano-vocal scores, transcriptions and arrangements and other scores to support solo instrument, voice, and chamber music performance. Performance scores are also useful for musicological research, music analysis, and composition.
For more information, see the "Score" article in Grove Music Online: