Using a Nelson Riddle orchestral arrangement of “You Make Me Feel So Young” […], Wolpert had a professional singer perform the melody. Then she used a digital multi-effect processor to create two bitonal versions of the accompaniment: one a full musical step higher (G when the singer was in F), and the other a step lower (E-flat). She then played the “music” for 40 nonmusicians and 10 professional musicians.
You can see where this is going, right? (via)