I used to work at a major outdoors retailer. The music on blast wasn't too bad most of the year because they actually had like a 12-hour playlist, so nothing repeated.

Then Christmas arrived. There were still no repeat tracks throughout the day. But the thing about Christmas songs is that there's only like 10 songs that have each been recorded by like 15 different artists, so while the individual recordings didn't repeat, we'd still hear the same song 8 times a shift.