DARIEN — A “pitch perfect” performance at Darien Library Sunday afternoon attracted a full house when The Zumbyes—Amherst College’s oldest a cappella group—entertained.

“I think one of the reasons we booked them here (is) that every show is a performance,” said Mallory Arents, head of adult programming. “They bring their personalities on stage.”

The all-male group, which is completely run by students and began almost 70 years ago, sang a range of melodic hits spanning the decades.

“I think we bring an energy that crowds can really connect with,” said singer David Green, “and we have some really tight harmonies that are enjoyable as well.”