For this Disquiet project I utilized 3 pieces of found sound: a construction site piledriver that echoed off a nearby building; some moody, dubby background music in the mens department at Sears a few years ago; someone playing an accordian on the sidewalk. Each are in 10-second segments. Looking at the instructions closer I am seeing the 90 second requirement means that each section does not need to be 10 seconds long.