In David Stubbs' book "Fear of Music", he parses the distinction between music and "sound art", and the challenges in staging quiet performances in galleries with the bleed in of extraneous noises: "The ambient sounds of parties of schoolchildren charging up and down the Corridor, the hum of central heating systems or the sharp patter of stiletto heels on wooden floorboards, are all potential sources of disruption."
This is the thing to leave in!