A 1979 album by the progressive rock group Rush. This album is arguably one of their most progressive and still retains much of the heaviness of their Led Zeppelin-influenced years. It is the last of their so-called progressive era, since after this album, they went on to record Permanent Waves, which was more geared to be radio-friendly. It features the 20 minute epic Hemispheres and the shorter instrumental La Villa Strangiato. Also notable is their short but very popular song The Trees. The songs are still very much in tune to progressive rock elements, including larger song structures, elongated solos, and odd time signatures.