Abba took a risk by launching this 1975 album (their second) with "Mamma Mia." How do you possibly follow that up? Simple--wait two songs and then zoom into "SOS," one of the best pop songs ever written. The rest of the album does not quite reach those dizzying heights, but it's strong nevertheless. Abba is all over the map, as if the band was still putting the finishing touches on its identity. Some songs, most notably "Hey, Hey Helen" and "Rock Me," are sustained by classic glam, Gary Glitter-like riffs.
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