Unisonya would sense things - his 'theme', the fact he's completely human with no extraordinary powers (but an incredible willpower/stubbornness) and in his early 30s, and that overall he has a great sense of grief, nostalgia sorrow underlying his every waking moment.
Harlock's associated with ocarinas, harps, and singing, genres a mix of Space sea shanties, and 70s-style folk music-faux medieval music.
Song of the Wandering boat is his general leifmotif when he's traveling across space or doing PIRATE things. Mayu's theme is one he himself plays, generally conveying his longing and wish to see his love ones again.
As his monster is a Siren, she can hear the Siren's longing and heartsickness under Harlock's song as a kind of wordless aria, trying to harmonize but just falling out of sync.
Sorry to tl;dr but his canon is surprisingly very musical for the genre.
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Harlock's associated with ocarinas, harps, and singing, genres a mix of
Spacesea shanties, and 70s-style folk music-faux medieval music.Song of the Wandering boat is his general leifmotif when he's traveling across space or doing PIRATE things.
Mayu's theme is one he himself plays, generally conveying his longing and wish to see his love ones again.
As his monster is a Siren, she can hear the Siren's longing and heartsickness under Harlock's song as a kind of wordless aria, trying to harmonize but just falling out of sync.
Sorry to tl;dr but his canon is surprisingly very musical for the genre.