tone travel

what is it called when you hear crystal synth waltzes & other intricate compositions where there are only fan motors humming, the moans of a distant ac or the dopplered refuse of other pedestrian mechanisms?...there must be a word for this specific mono-synesthesic phenomenon of filling in the blanks, so convincingly, that once a day, i stop & say to myself, "where is that crazy music coming from?" a full 30 seconds later, i have reduced the faint, yet elegant & ambitious harmonics down to a crude appliance. this has happened to me every day and/or night since my recent reclamation of solitude. and when my fan is going & a train screams past as an airplane leaves a sonic wake overhead...you better believe it takes me somewhere, very. very. far. away.