Apollo 440 (also known as Apollo Four Forty or @440) are an English electronic music group formed in Liverpool in 1990. The group has written, recorded, and produced five studio albums, collaborated with and produced other artists, remixed as Apollo 440 and as ambient cinematic alter-ego Stealth Sonic Orchestra, and created music for film, television, advertisements and multimedia. Over eleven years, they notched up eleven top-forty UK singles with three top-tens, and had a chart presence worldwide.
Its name comes from the Greek god Apollo and the frequency of concert pitch — the A note at 440 Hz, often denoted as "A440", and the Sequential Circuitssampler/sequencer, the Studio 440. They changed the writing of their name from Apollo 440 to Apollo Four Forty in 1996, though they switched back for their latest album. To date, Apollo's remixes number around sixty - from U2 in the early 1990s to Puff Daddy/Jimmy Page and Ennio Morricone a decade later. Among their Stealth Sonic Orchestra remixes are a series of Manic Street Preachers singles.