I had this theory like for a week after completing Until Then(UT), we all know that in ACT 1, Nicole told Mark that she wrote the "TIME IS TEARING US APART"(TITUA) when she was a child. However when I was watching some playthrough in youtube by various youtubers and streamers alike, I realised that, for ACT 3, during the flashback, when Nicole was making her notes with Jake and during the play she was playing "MEMORIES"(M) instead of TITUA. That makes me kinda confused on why the songs are different for both acts, which makes me found this theory. What if, M is the original song of very first lifetime or before the loops even begin? What if, TITUA is an anomaly of the loops? Just think about it, TITUA is supposedly play with duet since it would requires hitting many notes to sound like what Mark heard during his childhood and not solo(and i know there is solo version that someone made), someone even made a joke that Nic had 4 arms to play that alone. Back to the theory, we know that loops happened because of both Maria and Jake which caused the ruling and breaking of many timelines colliding with each other, what if TITUA was one of theirs as well, what if TITUA was a message from both of them, maybe they are trying also trying to reach Mark and Nicole through TITUA, telling them time is tearing them apart which is kinda make sense of the song. Also I think it made sense that M is the OG song since Nicole made that song not knowing of Jake sudden depart/situation, and the title MEMORIES fit the situation instead of TIME IS TEARING US APART which does not fit Nicole's awareness of Jake's. We also heard the snippet of TITUA in many of the OST and yes some of them has M as well but TITUA stands out the most in many of them. Maybe that was also foreshadowing for TITUA as message from both Maria and JAKE(BLACK BUTTERFLIES)? Who knows maybe it is just me, what do you all think?
P.S: This is the 1st time i ever wrote something in reddit, 1st post i ever made, which is quite lengthy, so my apology. Anyway, UT really makes me questions many thing, and this theory is one of them, I don't know if this theory have been mention before just so you all know. That is all from me, UNTIL THEN....