The online work Bicycle Built For Two Thousand (2009) by the American artists Aaron Koblin and Daniel Massey is comprised of over 2,000 voice recordings collected via Amazon's Mechanical Turk web service. Workers were asked to listen to a short sound clip, then record themselves imitating what they heard. The result was a reconstructed version of the song Daisy Bell - the first song to implement musical speech synthesis in 1962 - as rendered by a distributed system of human voices.
The workers involved completed their task in a web browser, through a custom audio recording tool created with Processing. They were not given any information about the project. The pay rate for each recording was $0.06 USD. In total, people from 71 countries participated. The top ten were the United States, India, Canada, United Kingdom, Macedonia, Philippines, Germany, Romania, Italy, and Pakistan. Daisy Bell was originally written by Harry Dacre in 1892. A 1962 rendition of the song by Max Mathews, John Kelly, and Carol Lockbaum served as the first example of musical speech synthesis. Later it also made a haunting appearance as the song HAL sings at the end of the film 2001: A Space Odyssey by Stanley Kubrick.