.5: The Gray Chapter is the fifth studio album by American heavy metal band Slipknot, released on October 17, 2014, by Roadrunner Records. It was the first studio album by the band in six years and the first not to feature original founding members bassist Paul Gray and drummer Joey Jordison due to the death of Gray in 2010, and Jordison being fired from the band in late 2013, as well as the only Slipknot album to feature original guitarist Donnie Steele on bass, although the tracks he played on are unknown, and the first Slipknot album to have Alessandro Venturella on bass and Jay Weinberg on drums. The album includes six singles and has received commercial success and acclaiming reviews. A standard and deluxe edition of the album was released. It is also the band's final studio album to feature their longtime percussionist Chris Fehn before his dismissal from the band due to a lawsuit in March 2019.

"Goodbye" is the fifth single from the American heavy metal band Slipknot from their fifth studio album .5: The Gray Chapter.