Question: Did Jimi Jamison or Andrew Montgomery's band begin performing earlier?

Context paragraphs:
Slaves and Masters: Slaves and Masters is the thirteenth studio album by the British rock band Deep Purple, and was released on 5 October 1990.  This is the only Deep Purple album to feature former Rainbow lead vocalist Joe Lynn Turner, who had joined the previous year after the firing of Ian Gillan.  Before hiring Turner, the band had considered singer Jimi Jamison of Survivor, but other obligations made him unavailable.

Andrew Montgomery: Andrew Montgomery is a Scottish singer who is best known as a member of late '90s Aberdeen indie rock band Geneva.

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.

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".

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."

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.

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.

Hybrid Ice: Hybrid Ice is a rock band from Danville, Pennsylvania, most notable for its song "Magdelene" released on the album "Hybrid Ice" in 1982, which became a radio hit at the time.  "Magdelene" was later covered by Boston on their 1994 album "Walk On".  In 1984, with two sold out shows, Hybrid Ice was the first rock band ever to play at the Bloomsburg Fair.  Hybrid Ice has toured with many notable musical acts, such as Foreigner, Kansas, Joan Jett, Bad Company, The Beach Boys, Steppenwolf, The Edgar Winter Group, Ted Nugent, and Lita Ford, as well as several others.  More recently they have played with Jimi Jamison of Survivor, John Cafferty of the Beaver Brown Band, Derek St.Holmes of the Ted Nugent band, and Kevin Chalfant of the Journey Experience.  And have played the "Legends of Rock" Cruise for 2015-17.

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".

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.

Supporting paragraphs: Jimi Jamison Andrew Montgomery
Answer: Jimmy Wayne "Jimi" Jamison