Question: Are Jeff Martin and Charlie Dominici both considered singers?

Context paragraphs:
Voodoo Highway: Voodoo Highway is the second album of the band Badlands.  After the first Badlands album, drummer Eric Singer left the band to join KISS, and was replaced by drummer Jeff Martin, who had previously sung lead vocals in the bands Surgical Steel and Racer X.  Badlands bandmates Greg Chaisson and Jeff Martin later played together in the bands Blindside Blues Band and RedSea.

Jeff Martin 777: Jeff Martin 777 was a rock band from Perth, Western Australia.  The band's name was inspired by Jeff Martin's study of the occult, specifically the work of Aleister Crowley.  Martin formed the band with former Sleepy Jackson members Malcolm Clark and Jay Cortez in 2010, after the demise of his previous band The Armada.  The band ended in 2012 after the re-activation of Martin's former group The Tea Party in 2011.

O3 A Trilogy: O A Trilogy is a studio album series by Dominici, released between 2005 and 2008.  It is a concept album trilogy about a terrorist sleeper cell coming to the United States and falling in love with the country.  The individual's assignment is not discussed in any depth.  It can be assumed that he is to destroy the First World (possibly the entire world) as evidenced by various lines throughout multiple songs, but he starts to have second thoughts, and is swayed to the other side by none other than the police officer who catches him.  "O A Trilogy" constitutes the only albums currently produced by Dominici.  Lead vocalist Charlie Dominici has stated that while the band will continue to record, he shows no interest in making more concept albums.

Jeff Martin (All My Children): Jeff Martin is a fictional character from the ABC soap opera "All My Children".  He is the oldest son of Joseph "Joe" Martin Sr. and his deceased wife, Helen Martin.  He portrayed most notably and for the longest tenure by Charles Frank, most recently portrayed by John James.

Charlie Dominici: Charlie Dominici (born June 16, 1951) is an American singer best known as the second vocalist for the progressive metal band Dream Theater, having replaced Chris Collins (while the band was called Majesty) and later being replaced by James LaBrie.  Most recently, Dominici has fronted his own self-named progressive metal band, who have released three albums.

Live at the Enmore Theatre (film): Live at the Enmore Theatre (2007) is a single DVD by Canadian singer/songwriter Jeff Martin and the Toronto Tabla Ensemble.  Like the Live in Brisbane 2006 album, the performance was recorded during Martin's September tour of Australia.  The DVD features an entire performance, as well as bonus material including an interview with Martin and Ritesh Das; backstage footage; scenes from soundcheck and an instore appearance; and a marriage proposal by a fan to another on stage.

Dominici (band): Dominici is a progressive metal band formed in 2005 by former Dream Theater vocalist Charlie Dominici.  Their only released work is the "", a series of three concept albums about the story of a terrorist sleeper cell coming to the United States and falling in love with the country.  Dominici was an opening-act for three Dream Theater "Chaos in Motion Tour" concerts that were held in Croatia, Hungary, and Austria.

Dream Theater discography: The discography of Dream Theater, an American progressive metal/rock band, consists of thirteen studio albums, one extended play, eight live albums, one compilation album, eight video albums, twenty-seven singles, and eleven music videos.  The band was formed under the name Majesty by guitarist John Petrucci, bassist John Myung, and drummer Mike Portnoy while the three of them were attending Berklee College of Music in September 1985.  The trio added keyboard player Kevin Moore and vocalist Chris Collins in order to complete their lineup.  After the band released a demo entitled "Majesty Demos", Collins was replaced by Charlie Dominici in November 1987.

Jeff Martin (Canadian musician): Jeffrey Scott Martin (born October 2, 1969 in Windsor, Ontario) is a Canadian guitarist and singer-songwriter best known for fronting the rock band The Tea Party.  Martin began his career as a solo artist in October 2005, when The Tea Party went on hiatus.

When Dream and Day Unite: When Dream and Day Unite is the debut studio album by American progressive metal/progressive rock band Dream Theater, released on March 6, 1989 through Mechanic/MCA Records.  The album is composed mainly of material that originally surfaced during the band's early years as Majesty, and is the only Dream Theater album to feature Charlie Dominici on vocals, as James LaBrie replaced Dominici as the lead vocalist on subsequent albums.

Supporting paragraphs: Jeff Martin (Canadian musician) Charlie Dominici
Answer: yes