Ryan is joined by Matt Kramer and Ryan Musser to talk about one of the most iconic rock albums of all time: Led Zeppelin IV. Selling over 37 million copies, this album made the already famous Led Zeppelin global megastars and ensured their dominance over 1970s rock music. Mysterious, bluesy, steeped in mythology and folklore (and a lot of Tolkien references), Led Zeppelin IV not only remains one of Zeppelin's best works of art, but one of the most celebrated albums in music history.