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The relentless touring throughout 1969 established the band as one of the top concert draws, paving the way for their second album, Led Zeppelin II, released on October 22, 1969. Critics began debating whether it was the first popular heavy metal album, particularly due to standout tracks like “Whole Lotta Love,” despite initial mixed responses.
As 1970 unfolded, Led Zeppelin’s concerts became legendary, often exceeding four hours with intricate performances. Their musical output evolved with the release of Led Zeppelin III in October 1970, which showcased a softer sound influenced by folk and acoustic music. This collection contained the iconic “Immigrant Song,” and marked their growth as musicians willing to experiment.