Led Zeppelin IV

Led Zeppelin IV sold 37 million copies globally and features "Stairway to Heaven," the most requested rock radio song of all time. Deliberately released without an album title or band name on the cover, it defied industry conventions while outselling 90% of its contemporaries. Its heavy blues-rock sound set a new standard, outperforming #4 Hotel California in pure rock influence and establishing Led Zeppelin as arena rock titans.