Question: Are both Mark Wystrach and Jimi Jamison American musicians?

Context paragraphs:
Mark Wystrach: Mark Wystrach (born December 17, 1979) is an American actor and country music singer.

Ordinary Average Guy: Ordinary Average Guy is the ninth solo studio album, and its title-track single (second on the playlist), by American singer-songwriter and multi-instrumentalist Joe Walsh.  The album was released in mid 1991.  It was Walsh's first album of entirely new music since "Got Any Gum? " in 1987, and his first solo album to be issued internationally by Epic following a four-year alliance with Warner Bros.  Records in the United States and Canada.  The album features Ringo Starr, Survivor's lead vocalist Jimi Jamison, and the drummer Joe Vitale from Walsh's former band Barnstorm.  Vitale also sings the lead vocals on the final track of the album, "School Days".

Venus Mars Project: Venus Mars Project is an American pop/rock duet from Boston, Massachusetts known for their mix of classic rock edge and modern pop.  The band consists of two members: Jacyn Tremblay (lead vocals) and Peter Tentindo (lead guitar, vocals).  Jacyn is a singer/songwriter, formerly signed with Universal Motown Records as part of the Boston-based female pop/r&b vocal group Jada, and Peter is a professional guitarist, singer/songwriter, and teacher, formerly backing the lead singer of Survivor, Jimi Jamison.

Burning Heart (song): "Burning Heart" is a song by Survivor.  It was sung by Jimi Jamison and appeared in the 1985 film "Rocky IV" and on its soundtrack album.  The single peaked at number 2 on the "Billboard" Hot 100 for two weeks in February 1986, behind "That's What Friends Are For" by Dionne and Friends.

Vital Signs (Survivor album): Vital Signs is the fifth studio album by American rock band Survivor and their first with vocalist Jimi Jamison.  The album was their second most successful in the U.S., reaching #16 on the Billboard Album charts and being certified platinum by the RIAA.  This album includes the singles "I Can't Hold Back", "High on You", "The Search Is Over" and "First Night."

When Seconds Count: When Seconds Count is the sixth album by the American rock band Survivor, released in October 1986.  It is the second album featuring vocalist Jimi Jamison.  The album included the hit single, "Is This Love", which peaked at #9 in the US on the "Billboard" Hot 100 chart in early 1987.  The album reached #49 on the "Billboard" 200 album chart.

Jimi Jamison: Jimmy Wayne "Jimi" Jamison (August 23, 1951 – September 1, 2014) was an American musician, singer, and songwriter.  He had previously been the frontman of the platinum-selling rock band Survivor between 1984–89, 2000–06 and from 2011 until his death.  Jamison is also known for writing and performing "I'm Always Here", the theme song for the TV series "Baywatch".

Got Any Gum?: Got Any Gum?  is the eighth solo studio album by the American singer-songwriter Joe Walsh.  It was originally released in October 1987, on the label Warner Brothers in the United States, and Full Moon in the UK, which was the last Walsh album to be released by either of those labels.  The album features eight original songs which were written by Walsh with others and by himself, the album also features two covers, including the song "In My Car", which was co-written by Walsh with Ringo Starr, the former drummer for The Beatles (the song was originally released on Starr's ninth studio solo album "Old Wave", in 1983).  The album also features vocal contributions from J. D. Souther and Survivor's lead vocalist Jimi Jamison.

I Can't Hold Back: "I Can't Hold Back" is a song recorded by the rock band Survivor.  It was the first hit single from their 1984 album "Vital Signs" (their first album with vocalist Jimi Jamison).  The song peaked at #13 in December 1984 on the "Billboard" Hot 100 chart.  It also peaked at #1 for three weeks on the "Billboard" Top Rock Tracks chart.

Too Hot to Sleep: Too Hot to Sleep is the seventh album from rock band Survivor, released in 1988.  It was a relative commercial disappointment, reaching only #187 on the Billboard album charts, though "Across The Miles" is one of their biggest AC chart hits.  After this album, founders Frankie Sullivan and Jim Peterik put the band on indefinite hiatus, while lead vocalist Jimi Jamison would continue to tour under the Survivor name (thus resulting in a lengthy court battle regarding rights to the name).  Drummer Marc Droubay and bassist Stephen Ellis were replaced by studio musicians on the album.  The lineup of Sullivan and Jamison would not reunite until 2000.

Supporting paragraphs: Mark Wystrach Jimi Jamison
Answer: yes