Question: who sang a whiter shade of pale first
[{'answer': 'Procol Harum', 'provenance': [{'wikipedia_id': '1369118', 'title': 'A Whiter Shade of Pale', 'start_paragraph_id': 1, 'start_character': 70, 'end_paragraph_id': 1, 'end_character': 82, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'British rock band Procol Harum', 'provenance': [{'wikipedia_id': '1369118', 'title': 'A Whiter Shade of Pale', 'start_paragraph_id': 1, 'start_character': 52, 'end_paragraph_id': 1, 'end_character': 82, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1369118', 'title': 'A Whiter Shade of Pale', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 450, 'bleu_score': 0.7848570000574331, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11166116001019535377}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1369118', 'title': 'A Whiter Shade of Pale', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['"A Whiter Shade of Pale" is the debut single by the British rock band Procol Harum,', 'A Whiter Shade of Pale" is the debut single by the British rock band Procol Harum']}}]}, {'provenance': [{'wikipedia_id': '1369118', 'title': 'A Whiter Shade of Pale', 'section': 'Section::::Promotional films.\n', 'start_paragraph_id': 25, 'end_paragraph_id': 25, 'meta': {'evidence_span': ['The first promotional clip for "A Whiter Shade of Pale" was shot in the ruins of Witley Court in Worcestershire, England. It features four of the five musicians who played on the hit single: Gary Brooker, Matthew Fisher, David Knights and Ray Royer, in performance and walking through the ruins. Only the drummer in the video is not on the record: early band member Bobby Harrison is seen miming to session man Bill Eyden\'s drumming. The film was directed by Peter Clifton, whose insertion of Vietnam War newsreel footage caused it to be banned from airplay on the BBC\'s "Top of the Pops" TV show. Procol Harum subsequently made a second promotional clip, using "', 'It features four of the five musicians who played on the hit single: Gary Brooker, Matthew Fisher, David Knights and Ray Royer, in']}}]}, {'provenance': [{'wikipedia_id': '2749205', 'title': 'Keith Reid', 'section': 'Section::::Biography.\n', 'start_paragraph_id': 3, 'end_paragraph_id': 3, 'meta': {'evidence_span': ['"A Whiter Shade of Pale", Procol Harum\'s first single,', 'Reid grew up in London. He left school at an early age to pursue a song writing career. He met Gary Brooker, lead singer with Procol Harum, with whom he co-wrote most of the band\'s songs (some music was written by organist Matthew Fisher and by guitarist Robin Trower), in 1966. They soon began collaborating, and their composition "A Whiter Shade of Pale", Procol Harum\'s first single, was released in 1967. It reached the top of the UK Singles Chart and sold over six million copies worldwide. Reid continued to write lyrics for the band until they disbanded in 1977. He also wrote the lyrics for two songs by the French singer Michel Polnareff in 1966 ("You\'ll Be On My Mind" and "Time Will Tell"), and was']}}]}]