Not my favorite but the most impactful probably was:
I used to turn on my save file on the GBA, run to Verdanturf Town, and leave the game on while closing my eyes or crying in bed. Even then, it felt really nostalgic and saddening/comforting. I would let myself wade in the emotions and sink into the bed, wishing it'd swallow me.
Same with this one.
Just really beautiful to witness after the long, long journey that is Paper Mario on the N64. The fireworks, the atmosphere... The OST wrapped up everything so well.
Ofc, there are a lot more OSTs from newer and more current games to mention but I treasure these two a lot.