Essential is a decent introduction for those who have never been exposed to Roxy Music, arguably the greatest art-rock band of all time. The first half of the collection's 16 tracks was culled from the group's first four albums; these comprise what is generally considered their golden period. The second half is an overview of the band's uneven transition into new wave and disco pop. Fans of Roxy's older music are on the fence about this stuff, yet it possesses its own special charms. To hear just how gloriously frantic these guys were on stage, check out the live version of "Do the Strand."