Black Sabbath guitarist Tony Iommi pulls back the curtain on the creation of Sabbath's classic riffs and the creation of heavy metal, delving into tracks including Paranoid, War Pigs and Iron Man. He's also joined by Queen's Brian May for an exclusive jam session.

Legendary guitarist Andy Summers reflects on his favourite riffs of all time and tells the stories of the riffs that brought fame and fortune to The Police, including the opening bars of Grammy Award-winning hit Every Breath You Take. Andy also pays a visit to one of the best jazz guitar players of all time, George Benson.

Heart's Nancy Wilson takes us on a very personal journey through the music and the riffs that influenced her, tracing a through-line from the music of Heart into the grunge scene of the 1990s. She's joined by Pearl Jam's Mike McCready and Soundgarden's Kim Thayil.