Although ABBA is often dismissed as mere sugary pop, a look at their biggest hits proves their songs are often more complex and inventive than their glossy surface might make them seem. For proof, one need look no further than "S.O.S." This pop gem starts off like a ballad with subdued verses that have a neo-classical feel to them. The mood abruptly changes at chorus time when the song suddenly shifts into a bright, up-tempo mode that brings the urgency of the narrator's need for love to life in a vivid fashion. This unusual but effective mix of ballad and up-tempo shadings results in an attention-getting tune that has inspired everyone from Erasure to Peter Cetera to record cover versions. However, ABBA's stylish rendition remains the best interpretation thanks to its skillful production: the shiny harmonies on the chorus are perfectly accented by some gorgeous acoustic guitar riffs and Andersson's fluttery synthesizer lines effectively bridge the gap between the song's ballad and up-tempo portions. This blend of ear candy and melodic sophistication made "S.O.S." a major international hit for ABBA and an enduring favorite of pop fans everywhere.