album_presenter.description.discover album_name=Knocking At Your Back Door (The Best Of Deep Purple In The 80's), artist_name=Deep Purple, records_count=1, countries_count=1, countries=Europe, media=CD, year_range=album_presenter.description.releases album_name=Knocking At Your Back Door (The Best Of Deep Purple In The 80's), artist_name=Deep Purple, records_count=1, countries_count=1, countries=Europe, media=CD, year_range=album_presenter.description.countries album_name=Knocking At Your Back Door (The Best Of Deep Purple In The 80's), artist_name=Deep Purple, records_count=1, countries_count=1, countries=Europe, media=CD, year_range=album_presenter.description.media album_name=Knocking At Your Back Door (The Best Of Deep Purple In The 80's), artist_name=Deep Purple, records_count=1, countries_count=1, countries=Europe, media=CD, year_range=