Jisho

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Noun, Noun, used as a suffix
1. keyMusic
Noun, Noun, used as a suffix
2. mode (in gagaku)Music
Noun, used as a suffix
3. time; tempo; rhythm
Noun, used as a suffix
4. meter (of a poem); metre
Noun, used as a suffix
5. style; form; mood; pattern
Noun
6. tax in kind (paid with locally produced goods; under the ritsuryō system)Historical term
Wikipedia definition
7. Key (music)In music theory, the key of a piece usually refers to the tonic note and chord, which gives a subjective sense of arrival and rest. Other notes and chords in the piece create varying degrees of tension, resolved when the tonic note and/or chord returns. The key may be major or minor, although major is assumed in a phrase like "this piece is in C. " Popular songs are usually in a key, and so is classical music during the common practice period, about 1650–1900.
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Read “Key (music)” on DBpedia

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