At first, Google only worked with books in the public domain. In December 2004, Google announced that it had created its library partnership with the Stanford, Harvard, Oxford, University of Michigan, and New York Public Library libraries to obtain works in both the public domain and limited copyright works from Stanford, Harvard, and the University of Michigan.  For works still protected by copyright, Google scanned the entire work and entered it into its searchable database, but only made available to users “snippet views” of the scanned pages in the search results. This reflects a similar approach amazon had taken to preview the book on its catalog pages.  In scores, relatively short pieces of music on two or four pages must be arranged in such a way as to minimize the number of page turns for the performer.