Task: Question Generation
Input (English): Passage: At the 56th Annual Grammy Awards in January 2014, Metallica performed "One" with Chinese pianist Lang Lang. In March 2014, Metallica began a tour called "Metallica By Request", in which fans request songs for the band to perform. A new song, titled "Lords of Summer" was written for the concerts and released as a "first take" demo in June 2014. In June 2014, the band headlined the Glastonbury Festival in an attempt to attract new fans. Ulrich said, "We have one shot, you never know if you'll be invited back". In November 2014, Metallica performed at the closing ceremony of BlizzCon 2014. In January 2015, Metallica announced a "Metallica Night" with the San Jose Sharks, which featured a Q&A session with the band and a charity auction benefiting the San Francisco Bay Chapter of the Sierra Club, but no performances. They were announced to headline Lollapalooza in March 2015, returning to perform there for the first time in 20 years. On May 2, 2015, Metallica performed their third annual Metallica Day at AT&T Park. Metallica were also announced to play at X Games for the first time at X Games Austin 2015 in Austin, Texas. On June 14, 2015, Hetfield and Hammett performed The Star-Spangled Banner live via electric guitars prior to game 5 of the NBA Finals between the Cleveland Cavaliers and Golden State Warriors at Oracle Arena in Oakland, California. In late October, the band unveiled a new website with an introduction from Ulrich containing footage from the studio of the band working on new material. On November 2, Metallica were announced to play "The Night Before" Super Bowl 50 at AT&T Park. Metallica announced they would be opening the U.S. Bank Stadium on August 20, 2016, with Avenged Sevenfold and Volbeat as support.
Output (English): For what concerts was the song "Lords of Summer" written?