noun
In music theory, the major and minor keys that share the same key signature. For example, C major and A minor are relative keys.
ハ長調の平行調はイ短調です。
The relative key of C major is A minor.
平行調の
Keys that are in a relative key relationship share the same key signature.
同主調 (parallel key) shares the same tonic note but has a different key signature (e.g., C major and C minor), while 平行調 (relative key) shares the same key signature but has a different tonic.
Compound of 平行 (parallel) and 調 (key). The term describes the parallel relationship between major and minor scales that share the same key signature.