An anniversary is usually a pretty straightforward thing: An event occurred at a certain time, and every year thereafter it’s appropriate to commemorate that event. Special celebrations are often observed at 5- and 10-year milestones.

The cooing they do when they’re babies is really where they should sing,” St. Anthony Park Elementary music teacher Brad Ollmann explained to parents at an open house for one of his kindergarten classes last fall. “Then they learn to talk, and they forget how to sing up there. So we have to get them back to it.”