They mean different things. Productivity 'Aid' generally reduces effort required, such as google search or a nail gun. Playing music is a classic motivator that does not reduce effort.
PS: I am sure the company’s bottom line loved your metrics. But, again that’s just driving corporate profits not middle class incomes.
Or: "It sure does cause people to work harder."
Both of these sentences cannot be true at the same time.
/drove a checkout part time for 4 years a while back, proud of my scan rates. There is an art to it the mastery of which brings great satisfaction.