Pretty darn good. Less than two minutes of playing……but I wonder how many hours of practice. Kudos, cashiers.
heh, no, that's a commercial. The sound track was made up and the video edited long after the video was shot.
It could be pulled off though with the proper software on the POS system. It'd require no interaction from the cashiers other than them all scanning stuff while it was playing. But when the note cadence awkwardly shifted as the beats did (instead of following the semi random but evenly paced scanning to that point), not even that could be pulled off in software without some cheating.