Are Tim Armstrong and Tyler Spencer both American singers?
yes
Title: Tyler Spencer
Passage: 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.
Title: The Stories Are True
Passage: 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".
Title: Tim Armstrong
Passage: 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.
Tyler Spencer Tim Armstrong