Our final example of sonification is the “quantum whistle”. This is a sound that occurs at a size scale where you could imagine it as the lead instrument in a jam with some bacteria playing nano-guitars! For more than 30 years scientists have been searching for evidence of oscillations in superfluid gases that are predicted by quantum theory. After months of staring at oscilloscope traces in vain, James Davis and Richard Packard decided to listen to their experiment instead. They heard a faint whistling sound that is the first evidence of quantum oscillations occurring between chambers of superfluid helium (Davis and Packard 1997). This may also be notable as the first example of a historically important discovery made using sonification (Scaletti in email to the icad@santafe.edu listserver).