[If you mind spoilers, please scroll away]

Um... Do you guys know about the piano that she was practicing? If you read Monika's poem, you can here the piano being tuned in the background... And there is some cool theory I was thinking in the shower that when Sayori and Yuri’s death was happening you can hear a piano in the background... Does it mean that Monika knew that they were gonna die so she was just getting prepaired for the song?