question: Both the single "Stay" and the debut studio album "Cloud Nine" were developed by which Norwegian DJ and record producer?
answer: Kygo
context: Title: It's Album Time
  Passage: It's Album Time is the debut studio album by Norwegian DJ and record producer Todd Terje, released on 8 April 2014 by Olsen Records.  The album was self-produced by Terje and was recorded in a span of three years.  It was met with generally positive reviews from music critics upon release.  The album debuted at number 2 in Terje's home country of Norway, number 4 on the "Billboard" Dance/Electronic Albums chart, number 23 on the UK Albums Chart, and number 6 on the UK Dance Albums chart.
  Title: Stay (Kygo song)
  Passage: "Stay" is a song by Norwegian DJ and record producer Kygo, featuring American singer Maty Noyes.  The song was produced by Kygo with fellow Norwegian, William Wiik Larsen, who also wrote it with Noyes.  It was released as the fourth single from Kygo's debut studio album, "Cloud Nine" (2016).  An official music video for the song was released on 18 February 2016.
  Title: Raging (song)
  Passage: "Raging" is a 2016 song by Norwegian DJ and record producer Kygo from his debut studio album, "Cloud Nine".  It was released as the second promotional single from the album on 1 April 2016, becoming later the fifth single from the album.  The song features Irish rock band Kodaline.  "Raging" also includes writing credits from James Bay.
  Title: Cloud Nine (Kygo album)
  Passage: Cloud Nine (Cloud IX) is the debut studio album by Norwegian DJ and record producer Kygo and features the likes of Maty Noyes, Conrad, Parson James, Tom Odell, Foxes, Matt Corby, RHODES, Will Heard, Julia Michaels, James Vincent McMorrow, Kodaline, Labrinth, John Legend and Angus & Julia Stone.  It was released on 13 May 2016 by Sony Music and Ultra Music.
citations: Stay (Kygo song) Cloud Nine (Kygo album)