Question: who sings the song it's just an illusion
[{'answer': 'the British trio Imagination', 'provenance': [{'wikipedia_id': '29606113', 'title': 'Just an Illusion', 'start_paragraph_id': 1, 'start_character': 32, 'end_paragraph_id': 1, 'end_character': 60, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '29606113', 'title': 'Just an Illusion', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 344, 'bleu_score': 0.930807147807393, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9819271123326596014}, 'section': 'Section::::Abstract.'}]}]