Question: "Firestone" is a song by which Norwegian DJ and record producer, Birdy performed a cover of the song on BBC Radio 1's Live Lounge?
Context: BBC Radio 1's Live Lounge 2012 is a compilation album consisting of live tracks played on Fearne Cotton's BBC Radio 1 show, both cover versions and original songs.  The album was released on 29 October 2012, and is the eighth in the series of Live Lounge albums. BBC Radio 1's Live Lounge 2013 is a compilation album consisting of live tracks played on Fearne Cotton's BBC Radio 1 show, both cover versions and original songs.  The album was released on 28 October 2013, and is the ninth in the series of Live Lounge albums. Ultimate Live Lounge was a competition run by Radio 1 in 2009 to find the best Live Lounge performance to date.  Over the previous 10 years there had been more than 500 Live Lounge sessions with hundreds of artists performing their single and an exclusive cover on air.  After a series of heats, three semi-finals, and a weekend-long Grand Final, BBC Radio 1 listeners chose their Ultimate Live Lounge Cover, "Stronger" by Thirty Seconds to Mars. This is an alphabetical list of the covers performed on the Live Lounge section of "The Fearne Cotton Show" on BBC Radio 1 (and previously on "The Jo Whiley Show" before Whiley left the station).  As well as this, songs performed in BBC Radio 1Xtra's Live Lounge are featured.  There are also a few that have performed at the Live Lounge tent at festivals such as Glastonbury Festival and Radio 1's Big Weekend.  Also some of the covers are performed on the Live Lounge Tour, in which the songs are performed at a location that means something to the artist. The Live Lounge Tour is a tour taken by BBC Radio 1 since 2006.  This features Jo Wiley/Fearne Cotton going to the Live Lounge artists' house, houseboat, local pub, mum's house, etc. to have a look around at a place that means something to the artist.  In 2010 the Live Lounge Tour was rebranded the 'Radio 1's Student Tour' with Fearne Cotton and Zane Lowe. The Live Lounge is a segment on the British radio stations BBC Radio 1 and BBC Radio 1Xtra.  Originally hosted by Jo Whiley on her mid-morning radio show and then by Fearne Cotton from 2009 until 2015.  It is now hosted by Clara Amfo, she has been the host since May 2015.  it exhibits well-known artists usually performing one song of their own and one by another artist, in an acoustic format.  The 'Live Lounge' itself is also a physical room in the Radio 1 studios, from where some of the performances are broadcast; however, due to its size, many are done from the BBC Maida Vale Studios.  From 2009, Trevor Nelson began hosting Live Lounges on his BBC Radio 1Xtra show, and was replaced in that slot by DJ Ace in 2017. On 27 January 2011 BBC Radio 1 launched a new extended version of the popular Live Lounge dubbed 'Live Lounge Special with...' or sometimes referred to as 'Live Lounge XL'.  The extended live lounge performance differs from the normal performance with an interview at the very beginning of the set rather than at the beginning of each track.  Then the artist performs 5 or 6 tracks uninterrupted, which can include a cover. "Firestone" is a song by Norwegian DJ and record producer Kygo, featuring vocals from Australian singer Conrad Sewell.  The lyrics and music were written by Dutch songwriter Martijn Konijnenburg, who was inspired by a Firestone billboard he saw in Venice, California.  It was released on 1 December 2014 and reached number one on the Norwegian Singles Chart and became a big international hit for Kygo on many other charts.  Birdy performed a cover of the song on BBC Radio 1's Live Lounge. BBC Radio 1's Live Lounge 2015 is a compilation album consisting of live tracks played on Clara Amfo's BBC Radio 1 show, both cover versions and original songs.  The album was released on 30 October 2015, and is the eleventh in the series of Live Lounge albums. Jasmine Lucilla Elizabeth Jennifer van den Bogaerde (born 15 May 1996), better known by her stage name Birdy, is an English musician, singer and songwriter.  She won the music competition Open Mic UK in 2008, at the age of 12.  Her debut single, a cover version of Bon Iver's "Skinny Love", was her breakthrough, charting all across Europe and earning platinum certification six times in Australia.  Her self-titled debut album, "Birdy", was released on 7 November 2011 to similar success, peaking at number 1 in Australia, Belgium and the Netherlands.  Her second studio album, "Fire Within", was released on 23 September 2013 in the UK.  At the 2014 Brit Awards she was nominated for Best British Female Solo Artist.  Her third studio album, "Beautiful Lies", was released on 25 March 2016.
Answer: Kygo