Immigrant Song is a raucous intro but Friends is very different - mysterious and mystical with acoustic instruments and strings. Unmatched atmosphere. Clean transition into Celebration Day and some great guitar and bass riffing. Then it's Since I've Been Loving You, with slow deep bass and emotional guitar. The vocals and drums are top notch and so is the lengthy solo. It's both delicate and very heavy. Out on the Tiles continues with some of the hardest rocking stuff yet. The intro riff is maybe the best on the record. It's an incredible first side. The other half is a bit more gentle, Gallows Pole leading out with folk guitar before the pounding drums come in. Tangerine is simply beautiful and That's the Way and Bron-Y-Aur Stomp are pure folk; the first one quiet and pretty, the second fit for a square dance session. Hats Off To (Roy) Harper is a dissonant closer with Plant's vocals run through a filter. This is a band signaling their intent. Hard to imagine changing anything.