The record was set at a World Record Appreciation Society event on
February 11, 2009. It took place at Pianos, a bar in New York City’s
Lower East Side. Corey Henderson and Dan Rollman were on hand to
document and time the record.
61 people from the Warner Bros. Television Marketing team called a woman named Amy on her birthday and surprised her by singing "Happy Birthday." RecordSetter Co-founder Dan Rollman was present to adjudicate the attempt.