Yale acappella group sings at Greenhills
![](https://www.greenhillsschool.org/wp-content/uploads/2010/08/bg-demo-1-100.jpg)
It’s hard to find sweeter harmonies than those created by the Whiffenpoofs of Yale University, the oldest collegiate a cappella singing group in the world. They stopped by Friday to serenade Greenhills’ upper school assembly.