Input: Article: From the beginning of 2014, Madonna began to make multiple media appearances. She appeared at the 56th Annual Grammy Awards in January 2014, performing "Open Your Heart" alongside rappers Macklemore & Ryan Lewis and singer Mary Lambert, who sang their single "Same Love", as 33 couples were wed onstage, officiated by Queen Latifah. Days later, she joined singer Miley Cyrus on her MTV Unplugged special, singing a mash-up of "Don't Tell Me" and Cyrus' single "We Can't Stop" (2013). She also extended her business ventures and in February 2014 the singer premiered MDNA Skin, a range of skin care products, in Tokyo, Japan. After visiting her hometown of Detroit during May 2014, Madonna decided to contribute funds to three of the city's organizations, to help eliminate poverty from there. The singer released a statement saying that she was inspired by their work, adding that "it was obvious to me that I had to get involved and be part of the solution to help Detroit recover".

Now answer this question: What song did Madonna sing at the ceremony?

Output: Open Your Heart

Input: Article: However, in order to manage the tensions present in the Spanish transition to democracy, the drafters of the current Spanish constitution avoided giving labels such as 'federal' to the territorial arrangements. Besides, unlike in the federal system, the main taxes are taken centrally from Madrid (except for the Basque Country and Navarre, which were recognized in the Spanish democratic constitution as charter territories drawing from historical reasons) and then distributed to the Autonomous Communities.

Now answer this question: Where are the main taxes taken?

Output: Madrid

Input: Article: After the Civil War, population expansion, railroad construction, and the disappearance of the buffalo herds heightened military tensions on the Great Plains. Several tribes, especially the Sioux and Comanche, fiercely resisted confinement to reservations. The main role of the Army was to keep indigenous peoples on reservations and to end their wars against settlers and each other, William Tecumseh Sherman and Philip Sheridan were in charge. A famous victory for the Plains Nations was the Battle of the Little Big Horn in 1876, when Col. George Armstrong Custer and two hundred plus members of the 7th Cavalry were killed by a force consisting of Native Americans from the Lakota, Northern Cheyenne, and Arapaho nations. The last significant conflict came in 1891.

Now answer this question: Who were two of the military leaders tasked with overseeing American policy of putting Indians on reservations?

Output:
William Tecumseh Sherman and Philip Sheridan