１５歳のテーマ／ひと夏の経験 山口百恵
The most used Key signatures in this album are F, F♯m, with major being the most reccurent mode.
Harmonic Profile １５歳のテーマ／ひと夏の経験
Album has 10 different key signatures, divided as follows:
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8 songs are major (out of 12).
