Spark！ -スパーク- K2 SOUND
The most used Key signatures in this album are C, Cm, F, D, F♯m, D♯, Em, G, with major being the most reccurent mode.
Harmonic Profile Spark！ -スパーク-
Album has 8 different key signatures, divided as follows:
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5 songs are major (out of 8).
