scratch track
n.β Β«I closed the door to my booth and put on my headphones. As the musicians recorded, I was supposed to sing a βscratch track,β one that would not be used but would let the band know when the singing would occur. The real singingβme with just the recorded instrumental tracksβwas booked for three more hours at 2 p.m.Β» ββWhen Walter Mitty Met Conway Twitty” by Bob Baker New York Times Mar. 25, 2007. (source: Double-Tongued Dictionary)