Question: Are Tim Armstrong and Tyler Spencer both American singers?

Context articles: Devils Brigade (album)
Evil Cowards
Gay Bar (song)
Tyler Spencer
Tim Timebomb
Tiger Army (album)
The Stories Are True
Tim Armstrong
Transplants (band)
Feur Buidhe an t-Samhraidh

Devils Brigade is the eponymous debut album by the rock band Devils Brigade, a side project by Matt Freeman of Rancid.
 The band, which performs a mix of punk rock and psychobilly, features Freeman on lead vocals and double bass in contrast to the backing vocals and electric bass guitar he typically performs in Rancid.
 Originally envisioned as a concept album about the construction of the Golden Gate Bridge, "Devils Brigade" was co-written by Freeman and his longtime bandmate Tim Armstrong, who also played guitar on the album and served as record producer alongside Ryan Foltz.
 The album also features X drummer DJ Bonebrake and contributions from Rancid's Lars Frederiksen, and was released August 31, 2010 through Armstrong's label Hellcat Records.
Evil Cowards is an electronic dance-rock band created by Tyler Spencer of Electric Six, and William Bates of Fall On Your Sword.
"Gay Bar" is a song by American rock band Electric Six.
 Written by band member Tyler Spencer, under the pseudonym Dick Valentine, it was released in June 2003 as the second single from their debut studio album, "Fire" (2003).
 While both the song and music video received significant airplay, lyrics mentioning war were edited due to their possibly offensive nature since the song made its air debut at the start of the Iraq War.
Tyler Spencer (born January 22, 1972), also known as Dick Valentine, is an American singer, songwriter, musician, and author.
 He is best known as the lead vocalist, main lyricist, and co-founder of the rock band Electric Six.
Tim Timebomb is a music project by Tim Armstrong, best known as a member of the punk rock band Rancid.
 Armstrong has recorded a large number of songs – a mixture of cover versions, including Rancid covers, and original songs, including some tracks from his musical film project "RocknNRoll Theater" – with a variety of supporting musicians.
Tiger Army is the first full-length release by California psychobilly band Tiger Army, released on October 26, 1999.
 The band had previously recorded a vinyl EP (the "Temptation EP") in 1996, and came to the attention of Tim Armstrong, the owner of Hellcat Records.
 Armstrong contacted Tiger Army's lead singer, Nick 13, interested in the band recording an album.
 Although Nick 13 did not initially have a confirmed line-up for the band, the studio line-up consisted of Nick 13, drummer Adam Carson (borrowed from AFI) and bassist Rob Peltier, from The Quakes.
The Stories Are True is a debut full-length album by the street punk band Time Again.
 It was released on April 25, 2006 on Tim Armstrong's label Hellcat Records.
 Tim Armstrong is also featured on the title track "The Stories Are True".
Timothy Ross “Tim” Armstrong (born on November 25, 1965) is an American musician, singer, songwriter, producer, and actor.
 He is best known as the singer/guitarist for the punk rock band Rancid and hip hop/punk rock supergroup the Transplants.
 Prior to forming Rancid, Armstrong was in the influential ska punk band Operation Ivy.
 In 1997, along with Brett Gurewitz of the band Bad Religion and owner of Epitaph Records, Armstrong founded Hellcat Records.
 In 2012, through his website, Armstrong started releasing music that influenced him, along with stripped-down cover songs of his own work under the name Tim Timebomb.
 He has released at least one song per week since late 2012.
 Armstrong is also a songwriter for other artists.
 Armstrong won a Grammy Award for his work with Jimmy Cliff and Pink and he has also worked with Joe Walsh.
Transplants are an American punk rock/rap rock supergroup.
 They formed in 1999 when Tim Armstrong (of the bands Rancid and Operation Ivy) played his friend and roadie Rob Aston some beats he had made using Pro Tools and asked Aston if he would consider contributing lyrics.
 Initially, Armstrong played all the instruments himself but as the project grew, he invited musician friends such as Matt Freeman (Rancid), Lars Frederiksen (Rancid), and Vic Ruggiero (The Slackers) to add to the sound.
 Before long, Armstrong and Aston decided to officially form a band, but to make things complete, they wanted a drummer, so Travis Barker from Blink-182 was asked to join in 2002.
Feur Buidhe an t-Samhraidh (Yellow Summer Grass) is a young adult novel written in Scottish Gaelic by Tim Armstrong and published by Sandstone Press in 2014.
 The novel is set in Scotland and the United States and follows Colman and Seonag, two young Scottish musicians who slip into a dangerous underworld of crime and violence when they become lost and separated from their band’s US tour.
 This is Armstrong’s second novel in Gaelic, following Air Cuan Dubh Drilseach, and it received mostly positive reviews.
 Writing in Dàna Magazine, Liam Alastair Crouse called the novel “exciting and enticing”, although he felt the author left some questions unanswered in the ending.
 While Ronald Black, writing in The Scotsman newspaper, noted that he particularly enjoyed the ending.