Question: Who were the players of the guest-appearing band on Mega Gem's debut album?

Context paragraphs:
The Same Old Blues: The Same Old Blues is the debut album from UK rock group Proud Mary.  The album was recorded at Wheeler End Studios in November, 2000 over a period of 7 days and released on Noel Gallagher's Sour Mash label.  The album was produced by Noel Gallagher assisted by Gem Archer, engineered by Stan Kybert and mixed by Mark "Spike" Stent at Olympic Studios in London.  The album was released in June, 2001 and reached #9 on the UK indie album charts.  It charted in the lower reaches of the UK top 100 mainstream chart, selling just over 800 copies causing Noel to comment that the band "Have to stand on their own two feet".  Despite this, the album was still received critically, enabling them to land many high-profile support slots.

Donkey (band): Donkey was a band formed in Athens, Georgia by its vocalist, Todd "T.B." Ferster.  Both of the band's albums were released on Amphion Records.  Their debut album, "Slick Night Out", was released in 1993 and was recorded live at the Point, a concert venue in the Atlanta, Georgia neighborhood of Little Five Points.  The album was recorded by Don McCollister, and included two horn players.  Also in 1994, the band released its second album, "Ten Cent Freaks".

Crossing the Railroad: Crossing the Railroad is the debut album by Indonesian rock band Wonderbra, released on May 3, 2007, by Liquid Records through LIMI labels.  All songs were written and arranged by Teraya Paramehta, Nosa Normanda, Asep Rachman Muchlas and Edy Sembodo with additional players such as Yuda Wahyudin in guitar and Rizki Mustafa Arisun in keyboards.  The album was produced from a series of coincidence.  At first the newly formed band was rehearsing in Liquid studio in 2005.  They performed some of their own songs from jamming session such as "Die Die Baby, Die!" , a punk song, and "Ordinary Orgasm" (unreleased).  Harry Sihombing, the owner of the studio, along with Ricky Benito Siahaan watched the band performed and offered them a recording deal.  Without further hesitation the band gladly accepted the offer.

Group Tamashii: Group Tamashii (グループ魂 , Gurūpu Tamashii ) is a Japanese comedy rock band.  It was started by actors in a theatrical company called "Otona Keikaku" (Project Adult) in 1995.  Its original members were Hakai (Sadao Abe), Boudou (Kankuro Kudo), and Baito Kun (Seminosuke Murasugi).  When it started, the group was just a group of comedians using the guitar.  The members perform in many theaters, and also at Shōten.  In 1997, bass, guitar, and drum players join and became a band.  In 2002 they released their debut album called "Run Tamashi Run" (Run魂Run ) while they were signed to an indie label, "MIDI".  In 2005, Group Tamashi signed to Ki/oon Records.  The name of the band derives from the song "Tamashi Kogashite" of the rock band ARB.  The reason they put the "Group" in the band name is "Nobody didn't say 'Group' by myself."  In 2008 they released a long-awaited new album entitled "Patsun Patsun".  It was their longest album to date, at 27 tracks, and featured them covering a new variety of musical genres such as reggae and hip-hop.  2010 marks the group's 15th anniversary, and several releases and events are scheduled in honor of it, including a new album entitled 1! 2! 3! 4! .

The Megas (band): The Megas is a Los Angeles based independent video game cover band based on the Capcom franchise, "Mega Man".  They differentiate themselves from artists who have played "Mega Man" music in the past by adding original lyrics and composing new sections which blend seamlessly with the original compositions.  Their lyrics expand on the simple story laid out in the games, giving each of the 8 Robot Masters a unique personality.  Their debut album, "Get Equipped", based on "Mega Man 2", was released in January 2008.

Mega Gem: Mega Gem is an American Indie Pop band founded in 2010 and based in Denver, Colorado.  On October 19, 2012, Mega Gem released their debut album, Colors of the West, on Wild Baby Records.  Colors of the West features 33 musicians, including guest a appearance by Stelth Ulvang of the Grammy nominated American folk band The Lumineers While their musical style may vary from traditional punk music, the band is still influenced by the DIY-Punk sub-culture.  The band's entire discography is available for a pay-what-you-want pricing scale on their Bandcamp page.

Noel Gallagher's High Flying Birds: Noel Gallagher's High Flying Birds are an English rock band formed in 2010 as the solo project of former Oasis lead guitarist/songwriter Noel Gallagher.  The band consists of former Oasis guitarist Gem Archer, former Oasis session pianist Mike Rowe, former Oasis drummer Chris Sharrock, and The Zutons bassist Russell Pritchard.  The band also has a variety of guests on their debut album such as the Crouch End Festival Chorus and The Wired Strings.

The Protomen (album): The Protomen, colloquially referred to by fans in retrospect as Act I, is the debut album release by indie rock band The Protomen.  It is a rock opera loosely based on the Mega Man video game series, and the first volume of a planned trilogy of albums on this theme.  The follow-up, "", was released on September 8, 2009.

The Lumineers: The Lumineers are an American folk rock/Americana band based in Denver, Colorado.  The founding members are Wesley Schultz (lead vocals, guitar) and Jeremiah Fraites (drums, percussion).  Schultz and Fraites began writing and performing together in Ramsey, New Jersey in 2005.  Cellist and vocalist Neyla Pekarek joined the band in 2010.  The Lumineers emerged as one of the most popular folk rock/Americana artists during the revival of those genres and their growing popularity in the 2010s.  The band's stripped back raw sound draws heavily from artists that influenced Schultz and Fraites such as Bruce Springsteen, Bob Dylan and Tom Petty.  They are known for their energetic live shows and several international hit singles including "Ho Hey”, “Stubborn Love”, “Ophelia” and “Cleopatra”.  The band has become one of the top touring bands in the U.S. and also sells out shows around the world.

Storm the Streets: Storm the Streets is the second studio album by the American punk rock band the Riverdales.  After a dispute with Lookout!  Records, the band signed to Honest Don's Records for this release.  It is the only Riverdales album still available from its original label.  In the liner notes to Screeching Weasel's "Thank You Very Little" (2000), Ben Weasel refers to "Storm the Streets" as a "gem" but admits that the record sold far less than its predecessor, "Riverdales" (1995).  The band broke up with the album's release.  "I Accuse My Parents" most likely takes its title from a movie of the same name which was featured on "Mystery Science Theater 3000", a television show mentioned in the song "I Think About You During the Commercials" from the Riverdales' debut album.

Supporting paragraphs: Mega Gem The Lumineers
Answer: Wesley Schultz (lead vocals, guitar) and Jeremiah Fraites