Question: The group that were the singing voices of the Be Sharps on The Simpson's episode "Homer's Barbershop Quartet" have performed at Walt Disney World since what year?
Sentence (from "The Dapper Dans"): A quartet (from the UK) also performed at Disneyland Paris from the opening in 1992 until 1995 and were known as the Mainstreet Quartet.
Relevant evidence: No