Space Truckin

Where its bandmates from the same era aimed for weight, this one aims for propulsion — an almost absurdly energetic rock-and-roll locomotive that can't stop even if it wanted to. The opening riff has a rolling, almost comedic momentum, Roger Glover's bass locking with Ian Paice's drums in a groove that insists on movement. Jon Lord's organ is the secret weapon, cutting through the mix with a carnivalesque swagger that keeps the song from ever feeling too serious about itself. Ian Gillan barrels through the verses with a looseness bordering on chaos, sounding like he's half-improvising, fully committed, maybe slightly unhinged — and that's exactly right for a song about freewheeling across the cosmos like a truck driver who doesn't need directions. The production has a live, slightly ragged feel, which gives it the quality of something captured rather than constructed. The song became an anthem of a very specific mid-seventies rock excess — arena-sized, communal, unconcerned with sophistication. You reach for it when you need to override whatever is making you feel small: on a long drive, windows down, volume up, with nowhere in particular to be.