Question: Carry On is a 4-CD career retrospective box set by Stephen Stills, including tracks with the vocal folk rock supergroup named what?
{'answer': 'Crosby, Stills, Nash & Young', 'supporting_facts': [['Carry On (Stephen Stills album)', 0], ['Carry On (Stephen Stills album)', 1], ['Crosby, Stills, Nash &amp; Young', 0], ['Crosby, Stills, Nash &amp; Young', 1]]}