"SOS" was the third single from Swedish pop group ABBA's self-titled 1975 album, their third for Polar Music and their second for Epic and Atlantic. It was released with "Man in the Middle" as the B-side. Agnetha Fältskog, who sang lead, recorded the song in Swedish on her 1975 solo album Elva kvinnor i ett hus. "SOS" was ABBA's first major worldwide hit since "Waterloo" and, to date, is the only Hot 100 single (or #1 single in Australia) in which both the title and the credited act are palindromes.
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