Question: who wrote and performed i can only imagine
[{'answer': 'Christian rock band MercyMe', 'provenance': [{'wikipedia_id': '2867531', 'title': 'I Can Only Imagine (MercyMe song)', 'start_paragraph_id': 1, 'start_character': 34, 'end_paragraph_id': 1, 'end_character': 61, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Bart Millard', 'provenance': [{'wikipedia_id': '2867531', 'title': 'I Can Only Imagine (MercyMe song)', 'start_paragraph_id': 1, 'start_character': 99, 'end_paragraph_id': 1, 'end_character': 111, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'MercyMe', 'provenance': [{'wikipedia_id': '2867531', 'title': 'I Can Only Imagine (MercyMe song)', 'start_paragraph_id': 0, 'start_character': 20, 'end_paragraph_id': 0, 'end_character': 27, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2867531', 'title': 'I Can Only Imagine (MercyMe song)', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['"I Can Only Imagine" is a song by Christian rock band MercyMe.', '"I Can Only Imagine" is a song by Christian rock band MercyMe. Written and composed by lead singer Bart Millard, the song was originally written for the band\'s 1999 independent album "The Worship Project" before being included on their 2001 major-label debut album "Almost There".', '"I Can Only Imagine" is a song by Christian rock band MercyMe. Written and composed by lead singer Bart Millard, the song was originally written for the band\'s 1999 independent album "']}}]}]