Question: what type of music is 3 doors down
[{'answer': 'Post-grunge'}, {'answer': 'hard rock', 'provenance': [{'wikipedia_id': '156002', 'title': '3 Doors Down', 'start_paragraph_id': 36, 'start_character': 236, 'end_paragraph_id': 36, 'end_character': 245, 'bleu_score': 1.0, 'section': 'Section::::The Better Life Foundation.\n'}]}, {'answer': 'alternative rock'}, {'answer': 'alternative metal'}]