Led Zeppelin released their third studio album, Led Zeppelin III. The band significantly moved away from its previous hard-rock sound, also incorporating folk and Celtic influences; the album included the song Immigrant Song.
Led Zeppelin performed before 6,000 people at Milwaukee Arena at a concert that had been moved from August 27. One reviewer wrote that the group started slowly but finished in great style, with the crowd gradually becoming captivated by the performance.
Led Zeppelin performed at the Sports Arena in San Diego, California. A local newspaper critic described the performance as resembling an evangelical religious service, with clapping, shouting, parading and an atmosphere of frenzy among the young audience.
Led Zeppelin performed at the San Diego Sports Arena during their North American tour. Jethro Tull and Seattle's The Surprise Package appeared as support acts.
Led Zeppelin performed at the Anaheim Convention Center in Anaheim, California, during their North American tour. Jethro Tull, who appeared as the opening act, were at No. 1 on the UK Albums Chart with their second album, “Stand Up”.