Question: who sings the song at the end of return of the king
[{'answer': 'Annie Lennox', 'provenance': [{'wikipedia_id': '1211389', 'title': 'Into the West (song)', 'start_paragraph_id': 1, 'start_character': 39, 'end_paragraph_id': 1, 'end_character': 51, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1211389', 'title': 'Into the West (song)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 448, 'bleu_score': 0.7941026413130391, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6610409119843658628}, 'section': 'Section::::Abstract.'}]}]