The disappearance of Hatsune Miku is quite a depressing song. The vocaloid notes multiple times how she is simply a vocaloid made to mimick humans, programmed to sing songs already made. She's just entertainment and will have to be put to an end eventually. The singer then starts to glitch at the end of the song, ending with "an irreversible error has occured." What makes this more sad is that Hatsune Miku is singing her non-existent heart out and the glitches prevent her from saying some of the things she wants to say.