When Happy Days first aired, it was a look back to an idealised culture twenty years previously. Now of course we are talking fifty or sixty years ago - but such is the power of popular music that it can transport us back to the days when every street corner had its Fonzie rebel and its wholesome Ritchie Cunningham. With hits from the likes of Jan & Dean, The Everly Brothers, Brenda Lee and Eddie Cochran - as Henry Winkler would say: 'The Fonz wants to dance!'