Question: What occupation is shared by Lajon Witherspoon and Sarah Nixey?

Context paragraphs:
Angel's Son: "Angel's Son" is a song written by Mikey Doling, Clint Lowery, Morgan Rose, Lajon Witherspoon of Sevendust and performed by Witherspoon and two fellow Sevendust members (drummer Morgan Rose and guitarist/vocalist Clint Lowery) and ex-Snot band member (now ex-Sevendust guitarist) Sonny Mayo, for the post-mortem compilation CD in honor of James Lynn Strait known as "Strait Up".  This was the only single track from the tribute album.

Seasons (Sevendust album): Seasons is the fourth studio album by American heavy metal band Sevendust.  It would be the band's final album with TVT Records and was dedicated to the memory of Reginald Witherspoon (Lajon Witherspoon's younger brother) and Dave Williams (Drowning Pool's original singer), the former was murdered in November 2002 and the latter died of cardiomyopathy in August 2002.

England Made Me (album): England Made Me is the debut studio album by English indie rock band Black Box Recorder, whose members include Luke Haines, Sarah Nixey and John Moore, released in July 1998 via Chrysalis Records.

Sevendust: Sevendust is an American alternative metal band from Atlanta, Georgia, formed in 1994 by bassist Vince Hornsby, drummer Morgan Rose and guitarist John Connolly.  After their first demo, lead vocalist Lajon Witherspoon and guitarist Clint Lowery joined the group.  Following a few name changes, the members settled on the name Sevendust and released their self-titled debut album on April 15, 1997.  They have attained success with three consecutive RIAA gold certified albums and have sold millions of albums worldwide.

The Past (song): "The Past" is the second single from the "" album produced by the American heavy metal band Sevendust.  This power ballad, with lead vocals from Lajon Witherspoon and featuring guest vocals by lead vocalist of the band "Daughtry", Chris Daughtry, is a bit of a departure for the band, falling more into the post-grunge category than what fans have come to expect from Sevendust.  "Sorrow", another song found on "", is similar in tone and also contains guest vocals, this time by Myles Kennedy.  Sevendust has not yet created a music video for "The Past".

Moment of Impact (album): Moment of Impact is the debut studio album by American rock group Eye Empire.  A Limited Edition 1000 copies were released on December 12, 2010 with a full release on September 14, 2011.  It features guest appearances from singer Lajon Witherspoon and drummer Morgan Rose of Sevendust.  It was later released as an expanded edition double album, with the title shortened to "Impact".

Lajon Witherspoon: Lajon "LJ" Jermaine Witherspoon (born October 3, 1972) is an American musician best known as the vocalist for the Atlanta-based alternative metal band Sevendust.

Sarah Nixey: Sarah Anne Nixey (born 21 December 1973 in Dorset, England) is a British singer songwriter, best known as the vocalist in Black Box Recorder.  Her debut solo album, "Sing, Memory", was released on 19 February 2007, followed by "Brave Tin Soldiers", released on 9 May 2011.  Nixey currently lives in London with her husband, music producer Jimmy Hogarth, whom she married in late 2010 and has one son, Reuben (born late 2007) and a daughter, Lola (born late 2012).  Nixey has a daughter, Ava (born 2001) from her previous marriage with John Moore.

Sing, Memory: Sing, Memory is the debut album from British Black Box Recorder vocalist, Sarah Nixey.  Recorded in London, and produced by James Banbury, the album is split into two halves, "Sing" and "Memory".  The title is probably a reference to Vladimir Nabokov's autobiography, "Speak, Memory".  It was released in the UK on February 19, 2007.

The Worst of Black Box Recorder: The Worst of Black Box Recorder is a 2001 album by Black Box Recorder, whose members include Luke Haines, Sarah Nixey and John Moore.  It is a compilation of B-sides from the singles of "England Made Me" and "The Facts Of Life".

Supporting paragraphs: Lajon Witherspoon Sarah Nixey
Answer: vocalist