Question: In music, an ostinato, is a motif or phrase that persistently repeats in the same musical voice, usually at the same pitch, well-known ostinato-based pieces include both classical compositions such as Donna Summer, was an American singer, songwriter, and painter, and she gained prominence during the disco era of which late era?
{'answer': '1970s', 'supporting_facts': [['Ostinato', 1], ['Donna Summer', 1]]}