@Yww Logically speaking, that was her own song - but from her original timeline of living as a top artist. We don't know if her old-self exists there or not as presented at all, so technically it's her own song.
Comment by necromorti on Yww
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@necromorti It said in a previous chapter that she's in a parallel timeline where her old self doesn't exist. So she took her own song from that timeline and claimed it here.