The Beatles' entire catalogue was recorded over forty years ago. Yet in both artistic and commercial terms, its power shows no sign of fading and the remastered versions of their albums have appeared in charts around the world. Paul Gambaccini presents a two-part series, in which a range of artists and record producers talk about the legacy of The Beatles. Part one, Ask Me Why, focuses on the various elements within the group that combined to make The Beatles so musically powerful: their strengths as performers - both instrumentally and vocally - plus the brilliance of John Lennon, Paul McCartney and George Harrison as songwriters. Interviewees include writer and film director Cameron Crowe, Dave Grohl (of Foo Fighers and Nirvana), Jeff Lynne (ELO), Mika, Tom Petty, Slash and Susan Werner.