Question: Pentatonix, the five-member American a cappella group lost their vocalist Avi Kaplan in 2017 at the same time as their tribute to which group received over 250 million views?
{'answer': 'Daft Punk', 'supporting_facts': [['Pentatonix', 4], ['Pentatonix', 5], ['Avi Kaplan', 0], ['Avi Kaplan', 1], ['Avi Kaplan', 2]]}