Question: Derek St. Holmes and Angela Gossow, have what occupation in common?

Context paragraphs:
Brent Fitz: Brent Fitz (born March 27, 1970) is a Canadian American musician and multi-instrumentalist.  In his career, he has worked with Slash, Myles Kennedy, Theory of a Deadman, Alice Cooper, Vince Neil, Union, Gene Simmons, The Guess Who, Brad Whitford from Aerosmith, Derek St. Holmes, Ronnie Montrose, Indigenous, Lamya, Streetheart, Harlequin, and Econoline Crush.

Arch Enemy: Arch Enemy is a Swedish melodic death metal band, originally a supergroup, from Halmstad, formed in 1996.  Its members were in bands such as Carcass, Armageddon, Carnage, Mercyful Fate, Spiritual Beggars, Nevermore, and Eucharist.  It was founded by Carcass guitarist Michael Amott along with Johan Liiva, who were both originally from the influential death metal band Carnage.  The band has released ten studio albums, three live albums, three video albums and four EPs.  The band was originally fronted by Johan Liiva, who was replaced by German Angela Gossow as lead vocalist in 2000.  Gossow left the band in March 2014 and was replaced by Canadian Alissa White-Gluz, while remaining as the group's manager.

Hey Baby (Ted Nugent song): "Hey Baby" is a rock single by the guitarist, vocalist and songwriter Ted Nugent from his first solo album, "Ted Nugent".  It was the only song in the whole album that Derek St. Holmes wrote and arranged himself.

Stranglehold (Ted Nugent song): "Stranglehold" is a single and the first track from Ted Nugent's self-titled 1975 album.  The vocals are performed not by Nugent, but by Derek St. Holmes.  However, the "Sometimes you wanna get higher" verse is sung by Ted himself.  In Martin Popoff's book, "Epic Ted Nugent", Nugent admits that the song "Stranglehold" was co-written by Rob Grange, yet he never received a share for co-writer.  "Stranglehold" would set the stage for Nugent's career, a guitar-driven track over eight minutes long - its famous guitar solo having been recorded in a single take.

Quinson Valentino: David Barry (born June 2, 1970) is a retired Canadian professional wrestler, trainer, and booker, best known by his ring name Quinson Valentino, who was a star on the independent circuit in eastern Canada and the Maritimes during the late 1990s and 2000s.  He also formed successful tag teams with Jerry Martell, Derek St. Holmes, and Cody Deaner, and is widely considered to be one of Ontario's best "heel" performers.

Angela Gossow: Angela Nathalie Gossow (born 5 November 1974) is a German vocalist, best known as the former lead vocalist for the Swedish melodic death metal band Arch Enemy.  Her other previous bands include Asmodina and Mistress.  She is considered to be one of the few successful female metal singers to use growling as her primary singing style.

Derek St. Holmes: Derek St. Holmes (born February 24, 1953) is an American musician, best known as the vocalist and rhythm guitar player for Ted Nugent's early solo career.

Cat Scratch Fever: Cat Scratch Fever is the third studio album by American guitarist and singer-songwriter Ted Nugent and his band, as well as the name of the album's title song.  Vocalist Derek St. Holmes, who had left the band during the recording of the album "Free-for-All", had come back for touring in 1976 and was again the lead singer on this album.

Arch Enemy discography: The following is a comprehensive discography of Arch Enemy, a Swedish melodic death metal band that formed in 1996.  Its members were in bands such as Carcass, Armageddon, Carnage, Mercyful Fate, Spiritual Beggars, and Eucharist.  It was founded by Carcass guitarist Michael Amott along with Johan Liiva, who were both originally from the influential death metal band Carnage.  The band has released ten studio albums, three live albums, three video albums and three EPs.  The band was originally fronted by Johan Liiva, who was replaced by German Angela Gossow as lead vocalist in 2000.  Gossow left the band in March 2014 and was replaced by Canadian Alissa White-Gluz, while remaining as the group's manager.

Whitford/St. Holmes: Whitford/St.  Holmes is the self-titled debut of then ex-Aerosmith guitarist Brad Whitford and then ex-Ted Nugent vocalist Derek St. Holmes, released in 1981.

Supporting paragraphs: Derek St. Holmes Angela Gossow
Answer: vocalist