Question: What is the name of Canadian vocalist and songwriter who is in both Explorers Club and Dream Theater?

Context paragraphs:
Carol Beckwith: Carol Beckwith (born November 12, 1945) is an American photographer, author, and artist known for her photojournalism documenting the indigenous tribal cultures of Africa, most notably in partnership with Australian photographer Angela Fisher.  Between them, Beckwith and Fisher have published 14 books, and have had their photos appear in "National Geographic, Natural History, African Arts, The Observer Magazine, Time, Life, Vogue, Marie Claire" and "Elle".  They continue to exhibit and lecture at galleries and museums worldwide, including The American Museum of Natural History and The Explorers Club in New York City, The Smithsonian Institution in Washington, DC, and the Royal Geographical Society in London.  They have also collaborated on four films about African traditions.  Together they have received numerous accolades, including the United Nations Award for Excellence, the Royal Geographical Society's Cherry Kearton Medal, two Anisfield-Wolf Book Awards, The Explorers Club's Lowell Thomas Award, and the WINGS WorldQuest Lifetime Achievement Award.

Underwater Explorers Club: The Underwater Explorers Club was founded in the early 1950s by businessman Harold Penman.  It collapsed when Harold Penman ran out of money and many members migrated to the British Sub-Aqua Club (BSAC).  The late Trevor Hampton, a British diving pioneer, had dealings with both the Underwater Explorers Club and BSAC.

James LaBrie: Kevin James LaBrie (born May 5, 1963) is a Canadian vocalist and songwriter, who is best known as the lead singer of the American progressive metal band Dream Theater.

Daryl Hawk: Daryl Hawk is a documentary photographer and owner of Hawk Photography-based out of Wilton, Connecticut.  He travels to some of the most remote places around the world taking photographs for magazines and presentations.  He has appeared on the "Today Show" showing his work.  Daryl Hawk is a member of the Explorers Club based out of New York City as well as the Royal Geographical Society.  He has carried the Explorers Club flag to Bhutan which is one of the club's greatest privileges.  According to the club's Web site, "A flag expedition must further the cause of exploration and field science."  Daryl hosts a Cablevision TV Show called "The Unconventional Traveler" where he interviews some of the worlds most renowned explorers.  Guests on his show have included Buzz Aldrin and Jane Goodall.  He also gives presentations across the country speaking of topics ranging from corporate ideas to photography.  Hawk also owns a photography business named Hawk Photography based out of Wilton, Connecticut in which he and his team shoot weddings, portraits and other events.  He has published two books.  The first "Distant Journeys" includes a compilation of 150 colored photographs and the second "Quiet Moments" which consists of 120 miscellaneous travel photographs.

Illumination Theory: "Illumination Theory" is a song by the progressive metal/rock band Dream Theater.  The song was released on 23 September 2013, as the closing track of the band's 12th album" Dream Theater".  It features a string ensemble conducted and arranged by Eren Başbuğ.  The song's lyrics, according to the guitarist John Petrucci, are about things for which people will live, die or kill.  The song's length is 22:17, making it Dream Theater's fifth longest to date.

Pre-Scenes From a Memory: Pre-Scenes From a Memory was a concert by Dream Theater, supporting Deep Purple, after the making of Dream Theater's album.  This was the first show Jordan Rudess played in the band as an official member of Dream Theater.  The show was held in Inchon, Seoul, South Korea (Triport '99 Rock Festival), July 31, 1999.  This also was the first rock festival ever in South Korea.

List of songs recorded by Dream Theater: This is a complete list of songs by American progressive metal band Dream Theater.  Dream Theater was formed in 1985 by guitarist John Petrucci, bassist John Myung, and drummer Mike Portnoy.  The band's current line-up consists of Petrucci, Myung, keyboardist Jordan Rudess, vocalist James LaBrie, and drummer Mike Mangini.  As of 2016, Dream Theater has released thirteen studio albums.

Explorers Club (band): Explorers Club is a progressive metal/rock supergroup headed by the Gardner brothers of Magellan featuring, among others, James LaBrie, John Petrucci of Dream Theater, and Derek Sherinian (then Dream Theater), D.C. Cooper (Royal Hunt), drummer Terry Bozzio, Billy Sheehan (bassist of UFO, Mr. Big and Steve Vai fame), James Murphy (from the metal scene)

A Sort of Homecoming (album): A Sort of Homecoming is a live album recorded at various locations (primarily The Theater at Madison Square Garden in New York City) by progressive metal band Dream Theater and released by the Dream Theater International Fan Club; thus, it is not part of the official Dream Theater discography.  It is named after the U2 song of the same name off their album "The Unforgettable Fire".

Mike Portnoy: Michael Stephen Portnoy (born April 20, 1967) is an American drummer primarily known as the former drummer, backing vocalist, and a co-founder of the progressive metal/rock band Dream Theater.  Known for his technical skill as a drummer, Portnoy has won 30 awards from the "Modern Drummer" magazine.  He co-produced six Dream Theater albums with guitarist John Petrucci, starting from "" through "Black Clouds and Silver Linings".  From "A Change of Seasons" onwards, Portnoy had been writing a significant amount of Dream Theater's lyrics.  He is the second youngest person (after Neil Peart) to be inducted into the "Modern Drummer's" "Hall of Fame", at 37 years of age.

Supporting paragraphs: Explorers Club (band) James LaBrie
Answer: James LaBrie