Why do I feel like only one person is singing when I listen to By2 s Love Breaks Through the Door ?

They used a bit of a remix, and because of the similarity in their voices and singing styles, it sounded like there was only one person singing.

You can try to listen with headphones, the sound of by2 is very similar, you can listen carefully with headphones on, and you will find changes.

Their voices are about the same, they don't sound the same.

Because the song doesn't have a pronounced harmonic lead (except at the end), and their voices are meant to be like, it sounds like a person.

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Because they're all the same, they all sound the same to you.