Rockapella is an American a cappella musical group formed in 1986 in New York City. The group's name is an amalgam of "rock" and "a cappella". Rockapella sings original vocal music and a cappella covers of pop and rock songs; and over time, their sound has evolved from high-energy pop and world music toward a more R&B-style sound. Rockapella initially found their biggest success in Japan throughout their career. They are also known for their role as a vocal house band and resident comedy troupe on the PBS children's geography game show Where in the World Is Carmen Sandiego?, based on the educational computer game of the same name developed and published by Broderbund. Rockapella has released 19 albums in both Japan and the United States, and three compilation albums in Japan. The text "All sounds provided by the voices and appendages of Rockapella", the central idea of the band, has appeared on all of their CDs since the addition of their vocal percussionist.