Question: Are Johnette Napolitano and Andi Deris both singers?

Context paragraphs:
Forever and One: "Forever and One (Neverland)" is a song by German power metal band Helloween taken from the album "The Time of the Oath" and composed by Andi Deris, lead vocalist of Helloween.  The German version of the single contains a live version of "In the Middle of a Heartbeat" from their album "High Live".

Are You Metal?: "Are You Metal?"  is a song and a single from German power metal band Helloween's thirteenth studio album 7 Sinners.  The single was released physically only in Japan, containing 3 songs.  There was also a digital single version available worldwide, which contained only the title song "Are You Metal?" , entirely composed by vocalist Andi Deris.

Come In from the Rain (Andi Deris album): Come In from the Rain is the first solo album of Andi Deris, vocalist of the power metal band Helloween.  It was released in 1997 and has a different sound from his band's albums, with a different style in each song.

Joey (Concrete Blonde song): "Joey" is the ninth track from Concrete Blonde's third and most successful album "Bloodletting".  The song was released in 1990 and was written and sung by Johnette Napolitano.  One interpretation is that the song is about a photographer (Joey Mas) who is in love with alcohol.  Napolitano mentioned in her book "Rough Mix" that the song was written about her relationship with Marc Moreland of the band Wall of Voodoo (who would eventually die of kidney failure following a liver transplant).

Andi Deris: Andreas "Andi" Deris (born 18 August 1964) is a German singer and songwriter, best known as the lead vocalist of power metal band Helloween, and co-founder and former lead singer of German melodic metal band Pink Cream 69.  He has an active solo career, as well as his own recording studio in Tenerife.

Johnette Napolitano: Johnette Napolitano (born September 22, 1957, Hollywood, Los Angeles, California) is an American singer, songwriter and bassist best known as the lead vocalist/songwriter and bassist for the alternative rock group Concrete Blonde.

Pink Cream 69: Pink Cream 69 is a German Hard rock/heavy metal band founded in 1987 in Karlsruhe, Germany by Andi Deris, Dennis Ward, Kosta Zafiriou and Alfred Koffler.  The band gained their first contract by winning music magazine "Metal Hammer" 's newcomer competition in Ludwigsburg one year after forming.  In 1994, Andi Deris left the band to join German power metal band Helloween.  He was replaced by British singer David Readman.

Nuclear Blast All-Stars: Into the Light: Into the Light is a compilation album from Nuclear Blast Records to commemorate their 20 years as a record label.  Produced by Rage guitarist Victor Smolski, with singers Tobias Sammet (of Edguy), Peter "Peavy" Wagner (Rage) - who has also written the lyrics for all songs -, Tony Kakko (Sonata Arctica), Mats Levén (Therion), Marcel "Schmier" Schirmer (Destruction), Hansi Kürsch (Blind Guardian), Andi Deris (Helloween), Oddleif Stensland (Communic), Marco Hietala (Nightwish and Tarot), and Tarja Turunen (Ex-Nightwish).  It features a variable collection of "All Stars" much in the same vein as Roadrunner United.  The whole album was written by Victor Smolski (however, two songs, "In the Picture" and "Slaves to the Desert" – originally "Slaves of the Desert" – are remakes of songs he had already recorded with Mind Odyssey), who also recorded all the guitars, some bass and keyboards.  The drums were done by Volker Schultz and André Hilgers.

Done by Mirrors: Done by Mirrors is the second solo album of Andi Deris, vocalist of the power metal band Helloween.  In Japan, it was released in 1999, but due to record company conflicts, had to be released in 2000 in the rest of the world.  The sound is different from Helloween, and from the previous album, "Come in from the Rain", with the dark thematic who would come in 2000 with Helloween's album "The Dark Ride".

Mrs. God: "Mrs. God" is a song and single by German power metal band Helloween from their album "".  The song is about the emancipation of women, showing Helloween's sense of humour.  It was written by the band's vocalist Andi Deris.

Supporting paragraphs: Johnette Napolitano Andi Deris
Answer: yes