Overtone (2004)

Suzuka, a member of a theatrical troupe, lives day by day with her boyfriend who is not on the same wavelength as her. On the other hand, Kai, the vocalist of the band "Burst," is frustrated by the differences between him and his bandmates. These two people, who live completely separate lives, meet by chance and feel a strange resonance. A unique love story with an emphasis on sound and music.

Unfortunately the movie Overtone is not yet available on HBO Max.