Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Dig deeper and discover this gem

In the grand scheme of things, Led Zeppelin's third record (1970) was the most dramatic shift the band had ever taken from its previous releases, but was necessary to produce their best record a year later. It is often referred to as the "acoustic" record, but the fact is that it boasts one of the early "heavy metal" tunes (the single, "Immigrant Song") two outright rockers ("Celebration", "Out on the Tiles"), and arguably their best original blues song ("Since I've Been Loving You"). The other six songs are acoustic, but explore a number of diverse avenues, from pure blues ("Hats Off to (Roy) Harper") to traditional folk ("Gallow's Pole") to hand-clapping boogie ("Bron-Yr-Aur Stomp") to spacey pop ("Tangerine") to affecting ballads ("That's The Way"). I highly recommend this LP and 'Physical Graphitti' as a starting point for anyone who wants to get beyond obvious hit records down into the real LZ.