Question: who sang the theme song to that 70s show
[{'answer': 'Todd Griffin', 'provenance': [{'wikipedia_id': '274551', 'title': "That '70s Show", 'start_paragraph_id': 40, 'start_character': 99, 'end_paragraph_id': 40, 'end_character': 111, 'bleu_score': 1.0, 'section': 'Section::::Production.:Opening.:Theme song.\n'}]}, {'answer': 'Cheap Trick', 'provenance': [{'wikipedia_id': '274551', 'title': "That '70s Show", 'start_paragraph_id': 40, 'start_character': 241, 'end_paragraph_id': 40, 'end_character': 252, 'bleu_score': 1.0, 'section': 'Section::::Production.:Opening.:Theme song.\n'}]}, {'answer': 'Big Star', 'provenance': [{'wikipedia_id': '274551', 'title': "That '70s Show", 'start_paragraph_id': 39, 'start_character': 112, 'end_paragraph_id': 39, 'end_character': 120, 'bleu_score': 1.0, 'section': 'Section::::Production.:Opening.:Theme song.\n'}]}, {'answer': 'Cheap Trick ( seasons 2 -- 8 )'}, {'answer': 'Todd Griffin ( season 1 )'}, {'provenance': [{'wikipedia_id': '274551', 'title': "That '70s Show", 'start_paragraph_id': 40, 'start_character': 0, 'end_paragraph_id': 40, 'end_character': 417, 'bleu_score': 0.974188104609039, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3104143745229310672}, 'section': 'Section::::Production.:Opening.:Theme song.\n'}]}, {'provenance': [{'wikipedia_id': '274551', 'title': "That '70s Show", 'section': 'Section::::Production.:Opening.:Theme song.\n', 'start_paragraph_id': 40, 'end_paragraph_id': 40, 'meta': {'evidence_span': ['Big Star\'s original version of the song was not used on the show. Instead, a cover version sung by Todd Griffin was used as the theme song for the show\'s first season. Beginning in the second season, the theme song was performed by the band Cheap Trick. Unlike previous versions of the song, Cheap Trick ended the song with the repeated phrase "We\'re all alright!" quoting the ending of their 1978 hit song "Surrender".', "Big Star's original version of the song was not used on the show. Instead, a cover version sung by Todd Griffin was used as the theme song for the show's first season. Beginning in the second season, the theme song was performed by the band Cheap Trick.", "Big Star's original version of the song was not used on the show. Instead, a cover version sung by Todd Griffin was used as the theme song for the show's first season. Beginning in the second season, the theme song was performed by the band Cheap Trick. Unlike previous versions of the song,"]}}]}]