When was Black Sabbath formed?
1968
1970
1970
1970
1970
1970
1970
1970
1970
1971
1970
1968
1971
1970
1968
1971
1970
1968
1971
1970
1968
1971
1970
1968
1969
1971
1970
1968
1969
1971
1970
1968
1969
1971
1970
1968
1969
1971
1970
1968
1969
1971
1970
1968
1973
1969
1971
1970
1968
1973
1969
1971
1970
1968
1973
1969
1971
1968
1973
1969
1971
1968
1973
1969
1 January 1970
1971
1968
1973
1969
1971
1968
1973
1969
1 April 1970
1971
1968
1973
1969
1 January 1970
1971
1968
1 January 1969
1973
1969
1971
1968
1973
1969
1 April 1970
1 January 1970
1 January 1969
1 January 1971
1971
1 February 1970
1968
1973
1 May 1970
1969
1965
1 January 1969
1 January 1971
1973
1969
1965
1 April 1970
1964
1 January 1970
1 April 1973
1 April 1971
7th April 1971
1973
7th April 1970
1969
1965
1964
1 January 1969
1972
1 April 1973
1 January 1971
1973
1969
1965
1 April 1970
1964
1 January 1970
7th April 1971
1972
7th April 1970
1 January 1969
1973
1969
1965
1967
April 1970
1964
April 1971
1 April 1973
1 January 1971
1972
1973
1965
1 April 1970
1967
1964
1 January 1970
1 January 1969
7th April 1973
1972
6 & 7
007
1973
1960
1965
1967
1964
1972
1970.
1 January 1970
1 January 1969
1 April 1973
7th April 1971
1 January 1971
1973
1960
1965
1967
7th April 1970
1964
1972
1970.
1973
1960
71-72
1965
1967
1964
1 January 1970
7th April 1972
1 January 1969
14–1972
1972
1973
1960
1965
1967
1970.
1964
1 January 1971
17th century
1972
1 January 1968
1974
1 January 1970
14–1970
1 January 1969
1960
1965
1967
1 October 1971
1 January 1973
1964