Question: "Sweet Brother Malcolm" is a song by an English singer and songwriter who Chris Martin described as what?

Context paragraphs:
Princess of China: "Princess of China" is a duet recorded by British rock band Coldplay and Barbadian singer Rihanna for Coldplay's fifth studio album "Mylo Xyloto".  The song was written by band members Guy Berryman, Jonny Buckland, Will Champion, and Chris Martin, along with Brian Eno, and is influenced by the music genres of electronic rock, electropop and R&B.  The song was released as the fourth single from "Mylo Xyloto" and was sent to US Mainstream radio on 14 February 2012.  It was later released as a digital download on 13 April 2012.  A companion EP to the single, featuring an acoustic version of the song, was released on 1 June 2012.

Richard Ashcroft: Richard Paul Ashcroft (born 11 September 1971) is an English singer and songwriter.  He was the lead singer and occasional rhythm guitarist of the alternative rock band The Verve from their formation in 1990 until their original split in 1999.  He became a successful solo artist in his own right, releasing three UK top three solo albums.  The Verve reformed in 2007 but again broke up by summer 2009.  Ashcroft then founded a new band, RPA & The United Nations of Sound, and released a new album on 19 July 2010.  On 22 February 2016 Ashcroft announced his fourth solo album, "These People", set for release 20 May 2016.  Chris Martin of Coldplay has described Ashcroft as "the best singer in the world".

Everglow: "Everglow" is a song by British rock band Coldplay.  It is the fourth track, promotional single and fifth single proper from their seventh studio album, "A Head Full of Dreams".  The song features uncredited guest vocals by Gwyneth Paltrow, the ex-wife of Chris Martin.  The song was served as a promotional single of the album and released on 26 November 2015.  The track was also premiered during Zane Lowe's Beats 1 radio show.  On 11 November 2016 it was released digitally as the fifth single proper from the album, in a newly-recorded stripped-down version that was inspired by Martin's unrehearsed solo performance of the song at the recent Glastonbury Festival due to a technical mishap.  The version ended with a sample of Muhammad Ali's 1977 speech in Newcastle upon Tyne.

Shiver (Coldplay song): "Shiver" is a song by British rock band Coldplay.  British record producer Ken Nelson and Coldplay produced the track for their debut album "Parachutes".  Lead singer Chris Martin admitted that "Shiver" was written for a specific woman, from whom the media has generated several speculations.  The song contains influences attributed to American singer-songwriter Jeff Buckley, whom Coldplay's early influences were drawn from.

Every Day's Like Christmas: "Every Day's Like Christmas" is a song by Australian recording artist Kylie Minogue, taken from her thirteenth studio album and first Holiday album, "Kylie Christmas" (2015).  It was written by Chris Martin, the frontman of the British alternative rock band, Coldplay and Stargate, who also produced.  Martin also sings the backing vocals of the song.  The song is an electronic pop ballad where Minogue describes her compassion towards her partner on Christmas Day.  It contains elements of modern electronic music and Christmas music.  A remix version by Stock Aitken Waterman was released as the third single from the album on 2 December 2015.

Yellow (Coldplay song): "Yellow" is a song by the British rock band Coldplay.  The band wrote the song and co-produced it with British record producer Ken Nelson for their debut album, "Parachutes" (2000).  The song's lyrics are a reference to the band's lead singer Chris Martin's unrequited love.

Homecoming (Kanye West song): "Homecoming" is a song by American hip-hop recording artist and record producer Kanye West.  It was included as the twelfth song on the track-listing of his third studio album "Graduation" (2007).  The track was produced by West with Warryn Campbell and features a guest appearance from Chris Martin, lead vocalist of the English alternative rock band Coldplay, who sings the song's chorus.  West met Chris Martin by chance at the famed Abbey Road Studios in London, England on February 14, 2006.  Afterwards, the two artists held an impromptu jam session and recorded the track.  "Homecoming" is actually a reworking of a track known as "Home (Windy)" that originated from a demo tape dating back to the year 2001.  The early recordings of "Home (Windy)" exhibit West's once trademark soulful vocal sample production style.  Additionally, the lyrics of the song's chorus are different than that of Martin's and were originally sung by singer John Legend, who was known at the time as John Stephens.  West wrote "Homecoming" as a tribute dedicated to his hometown of Chicago, Illinois.  His conceptual lyrics feature an extended metaphor where he uses a love interest to speak on his relationship with the city.

All Good Things (Come to an End): "All Good Things (Come to an End)" is a song by Canadian-Portuguese singer Nelly Furtado from her third studio album "Loose" (2006).  It was written by Furtado, Tim "Timbaland" Mosley, Chris Martin, and Nate "Danja" Hills.  The song was released as the album's third European single in November 2006.  It was released as the fourth single in the United States and Australia.  The single featured Chris Martin, frontman of the band Coldplay, harmonizing throughout the song.  The original version had him say a few words at the beginning, and sing the chorus behind Furtado.  Critically, "All Good Things (Come to an End)" was praised for having diversity in comparison to other songs on "Loose", but at the same time criticized for its mellowness.  Commercially, the song did well on the music charts, reaching number-one in more than fifteen countries including Austria, Czech Republic, Denmark, Germany and the Netherlands.

Blue Merle (band): Blue Merle was an American band centered in Nashville, Tennessee.  Their name comes from the lyrics of a Led Zeppelin song, "Bron-Y-Aur Stomp" from Led Zeppelin III, referring to a "blue-eyed merle" border collie dog.  Their lead singer Luke Reynolds, has a voice that has been compared to those of Chris Martin and Dave Matthews.  The band is also known for live renditions of the Talking Heads song "".

Why Not Nothing? / Sweet Brother Malcolm: "Why Not Nothing?"  and "Sweet Brother Malcolm" are songs by English singer-songwriter Richard Ashcroft and are featured on his 2006 album, "Keys to the World".  The two songs were released December 4, 2006 as a limited edition double A-sided 7-inch single from that album (see 2006 in British music).

Supporting paragraphs: Why Not Nothing? / Sweet Brother Malcolm Richard Ashcroft
Answer: the best singer in the world