Despite its mirror-ball packaging, The Disco Box presents the music as it was heard on AM radio, not in clubs. The 80 tunes are well-chosen, but almost all are heard in their single-edit version rather than in the often cathartic extended tracks that were one of the form's trademarks. Also, some of disco's best-loved divas (Loleatta Holloway, Taana Gardner) are left out of this history. Still, for those whose record collections don't represent one of pop's most glorious, insane (try 5000 Volts' "I'm On Fire"), inspiring moments, these four CDs are a worthy primer.