Another chance to hear Bob Harris present the ultimate rock radio playlist - The A-Z of AOR - a series featuring great rock tracks, power ballads, million-selling songs and album gems. Powered by the West Coast experimental music scene and the release of the Beatles' Sgt. Pepper LP, Album Orientated Rock (AOR) first burst onto American radio in San Francisco in 1967. It was a revelation, a tour de force of creative programming, which empowered its DJs and provided an antidote to the Top 40 hit radio that just wasn't "hip" anymore. By the mid-70s, AOR had become the most successful radio format in America. From Pink Floyd, Boston, Journey and Apple Tree Theatre; to Spirit, Tom Petty, Bruce Springsteen and Santana, The A-Z of AOR plays the biggest hits and the hidden gems from a genre that drove album sales into the triple millions.