After modifying the schema, these are your deliverables:
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There should be an index page for all the instruments, where the name of all the instruments should be listed out, alongside each of their classifications.
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I should also be able to save a new artist into the database. While it's possible for an artist to have the same name, an artist must have a name. An artist must also have an unique title. After successfully creating an artist, I should be taken to the artist's show page.