This is an entry in our Disneyland 101 Glossary: Disneyland Resort definitions in under 101 words, from Mouse Brief.
The Dapper Dans are a barbershop quartet group at Disneyland Park. They perform on Main Street U.S.A. You can recognize the Dapper Dans by their straw boater hats and colorful candy-striped attire. They sing classic Americana and Disney songs with special selections for holidays and limited-time events. The Dapper Dans are a long-time Disneyland favorite. You can find their schedule in the Disneyland app or hope to happen upon them as you wander Disneyland Park.
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