Worked at a grocery store as a stocker in high school. They had a tape that played piped-in music. Contemporary (80's) pop stuff with lyrics--not just instrumentals. Unfortunately the tape was only 60 minutes long so it would repeat every hour. After about 3 months of that the store manager about had a mutiny on his hands and finally broke down bought some more different and longer tapes.

Even today when a song comes on the radio that was on that 1-hour loop I cringe...