Jisho

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Noun
1. pitch; tone; key
Noun
2. time; tempo
Noun, Suffix
3. mood; tendency; style
Noun
4. tax paid in kind (ritsuryo period); first a tax on rice fields and households, then on individualsArchaism, also 徴
Wikipedia definition
5. 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.
Read “Key (music)” on English Wikipedia
Read “調” on Japanese Wikipedia
Read “Key (music)” on DBpedia

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