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Neal Morse
Neal Morse
American multi-instrumentalist and progressive rock composer
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Mike Portnoy
Mike Portnoy
American drummer
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The Sea Within
The Sea Within
international rock supergroup
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Roine Stolt
Roine Stolt
Swedish rock musician
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The Flower Kings
The Flower Kings
Swedish progressive rock group
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Daniel Gildenlöw
Daniel Gildenlöw
Swedish musician
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Flying Colors
Flying Colors
US supergroup
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Pete Trewavas
Pete Trewavas
British rock musician
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Edison's Children
Edison's Children
Rock Band
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Kino
Kino
British rock band
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Spock's Beard
Spock's Beard
American progressive rock band
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Kaipa
Kaipa
Swedish progressive rock group
12
The Winery Dogs
The Winery Dogs
American rock supergroup
13
Nick D'Virgilio
Nick D'Virgilio
American musician
14
Marillion
Marillion
British rock band
15
Dream Theater
Dream Theater
American progressive metal band
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Haken
Haken
British band
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Riverside
Riverside
Polish musical group; progressive rock band
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Pain of Salvation
Pain of Salvation
Swedish metal band
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OSI
OSI
American progressive rock band
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Liquid Tension Experiment
Liquid Tension Experiment
American band
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Distorted Harmony
Distorted Harmony
Isreaeli progressive metal band
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Quasar
Quasar
San Francisco based progressive rock band
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John Petrucci
John Petrucci
American guitarist

Transatlantic is a multinational progressive rock supergroup consisting of Neal Morse (ex-Spock's Beard), Roine Stolt (Kaipa, The Flower Kings, Agents of Mercy) , Pete Trewavas (Marillion, Edison's Children) and Mike Portnoy (ex-Dream Theater). They formed in 1999 as a side project to their full-time bands, but disbanded in 2002. They then reunited in 2009. Typical of the genre, the band's songs can range from very long epics that regularly exceed 15-20 minutes in length, to 'normal length' songs that each last five to ten minutes.

Despite not being an official member and not appearing on the studio albums, Daniel Gildenlöw (Pain of Salvation) has traditionally joined the band during live shows. However, due to illness, Ted Leonard (Spock's Beard, Enchant, Thought Chamber) stood in for him during the 2014 tour.