What makes Live!! +one by Iron Maiden notable?

This album helped solidify Iron Maiden's status within the New Wave of British Heavy Metal (NWOBHM) movement. Its critical reception was positive, showcasing the band's live prowess and leading to increased popularity, as evidenced by chart positions in the UK and Europe. Released on November 1, 1980, 'Live!! +one' is Iron Maiden's first live album, following their self-titled debut and 'Killers'. At this point in their career, they were gaining momentum in the burgeoning heavy metal scene, establishing a reputation for high-energy performances that captivated audiences across the UK.