The series turns its spotlight on that most magical era in musical history, the 1970s, when pop was at its most glamorous. Featuring interviews with the likes of Art Garfunkel, Blondie, ABBA, The Bee Gees, The Four Seasons and Gloria Gaynor, this is a 90-minute countdown of the 20 greatest musical moments from a time when everyone knew every week what was number one. Narrated by Zoe Ball, the show tells the stories behind those irresistibly evocative hits that still hold a special place in our hearts four decades later - from Blockbuster to Bridge Over Troubled Water, Dancing Queen to Hot Love, and I Will Survive toHeart of Glass. We reveal the results of an exclusive ITV poll to find out which 70s number one Britain loves the most