Apollo 440

Apollo 440 (also known as Apollo Four Forty or @440) are an English electronic music group formed in Liverpool in 1990. The group have written, recorded and produced five studio albums, collaborated with and produced other artists, remixed as Apollo 440 and as their ambient cinematic alter ego Stealth Sonic Orchestra, and created music for film, television, advertisements and multimedia. They notched up ten UK top 40 singles with three top tens, and had a chart presence worldwide. The group's name comes from the Apollo program and the frequency of concert pitch—the A note at 440 Hz, often denoted as "A440"—and the Sequential Circuits sampler/sequencer, the Studio 440.