Question: El DeBarge and King Diamond, have which mutual occupation?

Context articles: A Dream (DeBarge song)
King Diamond discography
Ultimate Collection (DeBarge album)
King Diamond
Chris Estes
El DeBarge
In a Special Way
Bad Boys (DeBarge album)
King Diamond (band)
El DeBarge (album)

"A Dream" is a song by DeBarge.
 Written by Bunny DeBarge and produced by El DeBarge, the song is from their hit album "In a Special Way".
 Although the track was not released as a single, the song has been popular over the years on R&B radio and has been sampled by several artists in the hip-hop and urban contemporary genres.
The discography of King Diamond, a Danish heavy metal band, consists of twelve studio releases, two live albums, five compilations, six singles, and four music videos. King Diamond was formed in 1985, after the dissolution of the group Mercyful Fate, by vocalist King Diamond, guitarists Andy LaRocque and Michael Denner, bassist Timi Hansen, and drummer Mikkey Dee.
 The following year, the band released their debut album "Fatal Portrait", which charted at number 33 in Sweden.
 King Diamond's second studio album, "Abigail", was released on February 24, 1987, and reached number 123 in the US, number 39 in Sweden and number 68 in the Netherlands.
 Following some line-up changes, the group released the album ""Them"" in 1988, which peaked at number 38 in Sweden, number 65 in the Netherlands, and at number 89 in the US, making ""Them"" King Diamond's highest charting album in North America.
 The following year, the band released the follow-up album "Conspiracy", which charted at number 111 in North America, number 41 in Sweden and at number 64 in the Netherlands.
 In 1990, after more line-up changes, King Diamond released the album "The Eye", which only charted at number 179 in the US, which makes "The Eye" King Diamond's lowest charting album in North America.
The Ultimate Collection is the eighth album released on Motown Records by the group DeBarge.
 The album is the second compilation of their greatest hits.
 In addition to the group numbers, it also includes solo singles from El DeBarge and Bunny DeBarge.
 It also includes a track from Chico DeBarge, who was never part of the family group.
 Also Motown was able to get the rights to the song "Dance All Night" from their Striped Horse Records album "Bad Boys" for this collection.
Kim Bendix Petersen (born 14 June 1956), better known by his stage name King Diamond, is a Danish heavy metal musician.
 As a vocalist, he is known for his extensive vocal range, in particular his usage of falsetto.
 He is the lead vocalist for both Mercyful Fate and the eponymous King Diamond.
Christopher Douglas Estes (born June 8, 1971) is a former King Diamond bass player (1994-1999).
 Originally from Dodge City, Kansas, Chris moved to Denton, Texas in 1991 to attend the University of North Texas as a Jazz Studies major.
 During his time at UNT he met Darrin Anthony Stull and joined his unsigned Dallas band Mindstorm.
 During the next three years Mindstorm played the Dallas club scene and eventually caught the attention of Danish singer King Diamond (Kim Bendix Peterson), who had recently moved to the DFW area and was looking for new members for his solo act.
 In early 1994 three members of Mindstorm (Estes, Darrin (Anthony) Stull, and Herb Simonsen) were officially asked to join King Diamond.
 During his tenure with King Diamond, Chris recorded three albums and took part in three tours, in addition earning writing credits on the album "Voodoo".
 Returning to college in 1997 and attending classes between studio sessions and tour, Chris eventually earned a degree in Computer Science.
 In the summer of 1999, Chris received word that the studio session for "House of God" had been postponed.
 Burdened by immediate financial needs, Chris reluctantly resigned his position in King Diamond.
 Chris currently lives and works in Richardson, Texas as a computer programmer.
 Chris continues to write and perform music as a hobby in his free time.
Eldra Patrick "El" DeBarge (born June 4, 1961) is an American singer-songwriter, producer and musician.
 DeBarge was the focal point and primary lead singer of the family group DeBarge throughout the early to mid-1980s.
 Popular songs led by El include "Time Will Reveal (song)", "Stay with Me", "All This Love", and "Rhythm of the Night".
In a Special Way is the third studio album by American R&B group DeBarge, released by Gordy Records on September 24, 1983.
 It was recorded at Kendun Records in Burbank and Westlake Audio in West Hollywood; written and produced by lead vocalist El DeBarge with additional writing by Mark, James and Bunny DeBarge.
Bad Boys is the fifth studio album released by R&B group DeBarge in 1987, after both El DeBarge and Bunny DeBarge had left the lineup.
King Diamond is a Danish heavy metal band formed in 1985 by vocalist King Diamond, guitarists Andy LaRocque and Michael Denner, bassist Timi Hansen and drummer Mikkey Dee.
 Diamond, Denner and Hansen had recently departed the group Mercyful Fate, and decided to form a new band under the King Diamond moniker, as it was already known from the Mercyful Fate days.
 In 1986, King Diamond released their debut album "Fatal Portrait".
 Since then the band have released a total of twelve studio albums (most of them concept albums), two live albums, two extended plays, five compilations and five singles.
El DeBarge is the self-titled debut album by El DeBarge.
 It was released in 1986 on Gordy Records (a sub-label of Motown) and featured the three hit singles, "Who's Johnny," which peaked at #3 on the Billboard Hot 100, "Love Always," which reached #43, and "Someone," which was a Top 20 Billboard A/C hit and made it to #70 on the Hot 100.
 Singer/actress Vanity featured on backing vocals on the track, "Secrets Of The Night".
 This album was certified by RIAA as gold in September, 1986, selling over 500,000 copies.