Go to "Advanced Search" screen and select "Author" and type in the name of a composer.
(Example: Mozart)
Under the search box, select "Format" and use the pull-down menu to choose "Musical Score."
OR
Go to "Advanced Search" screen and select "Anywhere" and type in a
a musical form (i.e., sonata)
or a topic (i.e., nature)
Under the search box, select "Format" and use the pull-down menu to choose "Musical Score."
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