| http://www.w3.org/ns/prov#value | - English can use nouns as adjectives, see for example english-zone.com/grammar/adjective3.html or usingenglish.com/glossary/noun-as-adjective.html If you understand that 'piano music' means 'music of piano' then you should have no problem with a concept that here 'piano' is a noun that is working as an adjective.
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