Question: What year did a barbershop quartet begin performing in a theme park that opened on July 17, 1955?
Sentence (from "The Dapper Dans"): The Dapper Dans are a barbershop quartet that performs at Disneyland in Anaheim, California (since 1959), at the Magic Kingdom at the Walt Disney World Resort (since 1971), and at Hong Kong Disneyland in Lantau Island, Hong Kong (from 2005 to 2008).
Relevant evidence: Yes