Their 3,000-strong database includes compositions by Bach, Beethoven and Mozart.

他们的数据库里有包括巴赫，贝多芬和莫扎特的作品在内的三千多首乐曲。

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Not only is the 80-page document a working manuscript for the only piano version of a major work by Beethoven, it is one of his few compositions for a piano duet.

这份长达80页的手稿不仅是贝多芬的一部主要作品的唯一钢琴演奏版，也是他创作的为数不多的钢琴二重奏乐谱之一。

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