The arrangement of the keys on "undo" feels like gentle rain as the piano section seamlessly drizzles and scatters throughout the foreground.
I REALLY loved the unorthodox progression of the keys, and how AER keeps the progression unpredictable by slipping in subtle surprises every now and then. The background is adorned with the cries of a wistful guitar while the pads maintain a ridiculously serene atmosphere. Definitely the kind of track that would put your worries to sleep the moment you immerse yourself in it!