band also played at the 2014 Bonnaroo Music and Arts Festival. On February 27, Brann Dailor told in the interview that their sixth album would be released in summer of 2014, and he also stated that the band would release an EP in winter of 2014. Some of the confirmed tracks were: "Tread Lightly", "Buzzard's Guts", "Scent of Bitter Almonds", "High Road" and "Aunt Lisa". In an interview with Troy Sanders in Paste magazine released on April 3, he revealed the album was called Once More 'Round the Sun and had 15 tracks. He also confirmed that Mastodon recorded 90 minutes of material, but only 60 minutes of it will be present on the album; the unreleased material possibly might be released on an EP later in 2014. A few more tracks that have been confirmed are: "Diamonds in the Witch House" (which has Scott Kelly from Neurosis on a guest vocal appearance), and "Ember City". In an interview on April 11, Dailor revealed the album will be released in June. On April 17, the first single "High Road" was made available for streaming. On April 26, Bill Kelliher revealed the title of the second single "Chimes at Midnight". As of June 16, 2014, the entire album is streaming on iTunes. The album was released on June 24, 2014, through Reprise Records. The album sold around 34,000 copies in the United States in its first week of release to land at position No. 6 on The Billboard 200 chart making it the band's first consecutive top 10 debut, with their previous album, The Hunter, peaking at No.10 after opening with 39,000 copies in 2011. Emperor of Sand and Cold Dark Place (2015–2018) On January 18, 2015, it was reported that Brent Hinds was working on a new Mastodon album, showing a picture with him playing the 13 string pedal steel. The same report was later confirmed by Troy Sanders, who stated: "Every record that we do is gonna sound different, because we always want to evolve and create our own musical path. And every record will be different. We do not wanna write the same record twice." On March 12, 2015, Mastodon released a new track called "White Walker", which appears on the Game of Thrones: Catch the Throne Vol. 2 mixtape to promote the fifth season of the HBO TV series Game of Thrones. Dailor, Hinds, and Kelliher also