and clicks as pseudo-drum sounds. A popular phrase that beat boxers use to begin their training is the phrase "boots and cats". As the beat boxer progresses in their training, they remove the vowels and continue on from there, emulating a "bts n cts n" sound, a solid base for beginner beat boxers. The phrase has become popular enough to where Siri recites "Boots and Cats" when you ask it to beatbox. Jazz vocalist Petra Haden used a four-track recorder to produce an a cappella version of The Who Sell Out including the instruments and fake advertisements on her album Petra Haden Sings: The Who Sell Out in 2005. Haden has also released a cappella versions of Journey's "Don't Stop Believin'", The Beach Boys' "God Only Knows" and Michael Jackson's "Thriller". Christian rock group Relient K recorded the song "Plead the Fifth" a cappella on their album Five Score and Seven Years Ago. The group recorded lead singer Matt Thiessen making drum noises and played them with an electronic drum machine to record the song, blurring the lines between true a cappella and instrument use. See also Lists of a cappella groups List of professional a cappella groups List of collegiate a cappella groups in the United States List of university a cappella groups in the United Kingdom Notes Footnotes References External links A Cappella Music Awards Singing Vocal music Musical terminology Medieval music genres 16th-century music genres 20th-century music genres 21st-century music genres Italian words and phrases