I want to know the answer to the following question:
Along with Mumford & Sons, Of Monsters & Men, Ed Sheeran and The Lumineers, what indie artist has had adult contemporary success?
All the background I'm provided with is that "Since the mid-2000s, the mainstreaming of bands like Wilco and Feist have pushed indie rock into the adult contemporary conversation.". Is that enough to answer the question?
Answer: no