Christmas Jollies II is the tenth album, done by The Salsoul Orchestra, produced by disco producer Patrick Adams, recorded and released in December 1981 on Salsoul Records.
 It is the follow-up that wasn't successful to the first Christmas Jollies, released in 1976, produced by Vincent Montana, Jr..
 Side one features lead vocals by Wendell Morrison and Marian Rolle, who were with the The Players Association on the 1980 album, We've Got The Groove, plus Jocelyn Brown.
 Side two is instrumental, with flutist Art Webb, especially on 2 disco versions of two tracks, "The Salsoul Christmas Suite", based on "The Nutcracker Suite" and "Joyful Spirit", based on "Jesu, Joy of Man's Desiring".
 The mid-tempo disco version of "God Rest You Merry Gentlemen" is semi-instrumental with the vocal chorus singing.
 On that disco version of God Rest Ye Merry Gentlemen, Jocelyn Brown did not sing the lead; it was a chorus of 5 studio singers singing in the background, named, Venus Dodson, Wendell Morrison, Marian Rolle, Rene Mills and Margo Williams.
 That's why The Cayre brothers, named, Joe, Stan & Ken from Salsoul Records made a mistake on the back cover of the album.
Alen Hodzovic is a German actor and singer, currently based in Berlin.
 In 2009, he became the first German citizen to win First Prize at Kurt Weill Foundation's international Lotte Lenya Competition for singers.
 He graduated from the Royal Academy of Music in London where he won the H.L. Hammond Prize for Verse Speaking, adjudicated by director John Caird.
 He played Raoul in the Stuttgart production of Andrew Lloyd Webber's "The Phantom of the Opera" and Ken in a German-language production of John Logan's play "Red".
 In 2007, he appeared as a background singer for Elton John at the "Concert for Diana" at Wembley Stadium.
DevilDriver is the self-titled debut album by California-based heavy metal band DevilDriver, the new band of former Coal Chamber singer Dez Fafara.
 In comparison to the other albums by DevilDriver, it is musically simpler, and Fafara sings in a different style.
Deliverance was a German-Canadian Christian pop and rock music band that was active in the 1970s until 1981.
 Danny Janz, Ken Janz, and Paul Janz formed Deliverance in Lörrach, Germany though the three were from Calgary, Alberta, Canada.
 All three were raised in Basel, Switzerland and attended Black Forest Academy.
 Danny and Paul Janz had already performed together as "Danny and Paul" but joined with Ken in 1974 to form Deliverance – combining the "Janz Team Singers" with "Danny, Paul & Wayne" and created a dynamic new band.
 Guy Roellinger and Dave McSparran also joined the band during its history.
 The band released four albums before Paul Janz embarked on a solo career.
The 101 Ranch Boys was an American country western band.
 Formed in Kansas City, Kansas in the 1930s the group was based in York, Pennsylvania where they broadcast their own local radio program on WSBA (AM).
 They later had their own radio program for ABC radio which was broadcast both nationally and internationally through affiliates.
 They recorded albums for Columbia Records and also gave concerts internationally; both as a band and accompanying famous country singers.
 Some of the artists they performed with were Gene Autry, Rex Allen, Ken Maynard, Jimmy Wakely, and Ken Curtis.
DevilDriver are an American heavy metal band from Santa Barbara, California, formed in 2002, consisting of vocalist Dez Fafara (the only remaining original member), guitarists Mike Spreitzer and Neal Tiemann, drummer Austin D'Amond, and bassist Diego "Ashes" Ibarra.
 The band was originally named Deathride, however, due to copyright issues and the name being taken by several bands , Deathride changed its name to DevilDriver, which refers to bells Italian Wiccans used to drive evil forces away.
Bradley James 'Dez' Fafara (born May 12, 1966) is an American metal vocalist who performs in the bands DevilDriver and Coal Chamber.
Coal Chamber was an American nu metal band formed in Los Angeles, California in 1993.
 Prior to Coal Chamber, Dez Fafara and Meegs Rascón formed the band She's In Pain in 1992.
 The two decided to create Coal Chamber.
 They disbanded in 2003 after ten years together, but announced a reunion in September 2011.
 Their first drummer, Jon Tor, was eventually replaced by Mike Cox (who beat out his older brother for the spot).
 After bass guitarist Rayna Foss joined, the Coal Chamber lineup was complete.
All lyrics by Dez Fafara and all music by Mike Spreitzer, Neal Tiemann and Austin D'Amond.
Lee Jae-hwan (Hangul: 이재환 born April 6, 1992), better known by his stage name Ken (Hangul: 켄 ), is a South Korean singer and actor, signed under Jellyfish Entertainment.
 He is one of the members in the South Korean boy group VIXX and has been widely praised for his unique, soulful, and husky vocal tone.
 Ken began his acting career in 2014 in MBC Every 1's comedy drama "Boarding House No. 24" as Lee Jaehwan.

Question: Were Dez Fafara and Ken both singers?
Answer: yes