What makes Immigrant Song by Led Zeppelin notable?

'Immigrant Song' reached number 16 on the Billboard Hot 100 and became an enduring classic, often associated with themes of Viking conquest. Its iconic riff and memorable chorus have influenced countless artists and have been featured in various media, cementing its place in rock history. Released on November 5, 1970, 'Immigrant Song' came during Led Zeppelin's peak popularity following their third album. The single showcased their evolving sound and bold lyrical themes, solidifying their influence in rock music.