Question: Which American actor that founded Thunderant.com stared in "Late Night" as the bandleader of the show's house band?

full_context: Document 1: Late-night talk show: A late-night talk show is a genre of talk show popular in the United States, where the format originated. It is generally structured around humorous monologues about the day's news, guest interviews, comedy sketches and music performances. The late-night talk show format was popularized, though not invented, by Johnny Carson with "The Tonight Show Starring Johnny Carson" on NBC. Typically the show's host conducts interviews from behind a desk, while the guest is seated on a couch. Many late night talk shows feature a house band which generally performs cover songs for the studio audience during commercial breaks and occasionally will back up a guest artist.
Document 2: Portlandia (TV series): Portlandia is a sketch comedy television series set and filmed in and around Portland, Oregon, starring Fred Armisen and Carrie Brownstein. The show is produced by Broadway Video Television and IFC Original Productions. It was created by Fred Armisen and Carrie Brownstein, along with Jonathan Krisel, who directs it. It debuted on IFC on January 21, 2011.
Document 3: The 8G Band: The 8G Band is the house band for "Late Night with Seth Meyers". The band is led by "Saturday Night Live" alumnus Fred Armisen. He assembled the 8G Band, named for the studio where the show is taped, just two weeks before the test show. He texted friends Seth Jabour, Syd Butler and Eli Janney ("What are you guys doing this week?"), then found first drummer Kimberly Thompson through an audition. Guitarist Marnie Stern later joined as well. After Thompson left the band, guest musicians frequently sit in often for an entire week. Some notable names to sit in on the drum kit include: Patrick Carney, Chad Smith, David Lovering, Kenny Aronoff, Jon Theodore, Nicko McBrain, Matt Sorum, Brad Wilk, Darren King, Danny Carey, Abe Cunningham, Dave Lombardo, Brann Dailor, Jimmy Chamberlin, Matt Cameron, and Abe Laboriel Jr. as well as other guest musicians. Additionally singer, guitarist: J Mascis, Bob Mould and others have also sat in with the band.
Document 4: List of Portlandia episodes: "Portlandia" is an American satire television series created by Fred Armisen, Carrie Brownstein and Jonathan Krisel. The series stars Armisen and Brownstein. It premiered on January 21, 2011, on IFC. s of 9, 2017, episodes of "Portlandia " have aired.
Document 5: Portlandia (season 6): The sixth season of the television comedy "Portlandia" began airing on IFC in the United States on January 21, 2016, consisting a total of 10 episodes. The series stars Fred Armisen and Carrie Brownstein.
Document 6: List of Late Night with Jimmy Fallon episodes: This is the list of episodes for "Late Night with Jimmy Fallon", an American late-night talk show that aired weeknights at 12:35 am Eastern/11:35 pm Central on NBC in the United States. The hour-long show aired from March 2, 2009 to February 7, 2014 and was hosted by actor, comedian and performer Jimmy Fallon, an alumnus of "Saturday Night Live". Hip hop/neo soul band The Roots served as the show's house band, and Steve Higgins as the show's announcer.
Document 7: Will Ferrell: John William Ferrell ( ; born July 16, 1967) is an American actor, comedian, producer, and writer. He first established himself in the mid-1990s as a cast member on the NBC sketch comedy show "Saturday Night Live", and has subsequently starred in comedy films such as "" (2004), "" (2006), "Step Brothers" (2008), "The Other Guys" (2010) and "" (2013), all but one of which he co-wrote with his comedy partner Adam McKay. The two also founded the comedy website Funny or Die in 2007. Other films roles include "Elf", "Old School" (both 2003), "Blades of Glory" (2007), and the animated films "Megamind" (2010) and "The Lego Movie" (2014).
Document 8: Fred Armisen: Fereydun Robert "Fred" Armisen (born December 4, 1966) is an American actor, comedian, voice artist, screenwriter, producer, singer, and musician. Widely known as a cast member on "Saturday Night Live" from 2002 until 2013, Armisen has portrayed characters in comedy films, including "EuroTrip", "", and "Cop Out". With his comedy partner Carrie Brownstein, Armisen is the co-creator and co-star of the IFC sketch comedy series "Portlandia". Armisen founded ThunderAnt.com, a website that features the comedy sketches created with Brownstein, and is the bandleader for the "Late Night with Seth Meyers" house band, The 8G Band.
Document 9: The Late Late Show with Craig Ferguson: The Late Late Show with Craig Ferguson is an American late-night talk show hosted by Scottish American comedian Craig Ferguson. It was the third iteration of the "Late Late Show" franchise, airing from 2005 to 2014. It followed the "Late Show with David Letterman" in the CBS late-night lineup, airing weekdays in the U.S. at 12:37 a.m. Taped in front of a live studio audience from Monday to Friday at CBS Television City in Los Angeles, California, directly above the Bob Barker Studio (Studio 33), it was produced by David Letterman's production company Worldwide Pants Incorporated and CBS Television Studios.
Document 10: Portlandia (TV series): Portlandia is a sketch comedy television series set and filmed in and around Portland, Oregon, starring Fred Armisen and Carrie Brownstein. The show is produced by Broadway Video Television and IFC Original Productions. It was created by Fred Armisen and Carrie Brownstein, along with Jonathan Krisel, who directs it. It debuted on IFC on January 21, 2011.
Document 11: Late Night with Seth Meyers: Late Night with Seth Meyers is an American late-night talk show hosted by Seth Meyers on NBC. The show premiered on February 24, 2014 and is produced by Broadway Video and Universal Television. It is the fourth incarnation of NBC's long-running "Late Night" franchise. The show also stars bandleader Fred Armisen and the 8-G Band, the show's house band. "Late Night" is produced by former "Saturday Night Live" producer Mike Shoemaker and executive-produced by Lorne Michaels. The show records from Studio 8G at 30 Rockefeller Plaza in New York City.
Document 12: The Tonight Show Starring Jimmy Fallon: The Tonight Show Starring Jimmy Fallon is an American late-night talk show hosted by Jimmy Fallon, on NBC. The show premiered on February 17, 2014, and is produced by Broadway Video and Universal Television. It is the seventh incarnation of NBC's long-running "Tonight Show" franchise, with Fallon serving as the sixth host. The show also stars sidekick and announcer Steve Higgins and house band The Roots. "The Tonight Show" is produced by Katie Hockmeyer and executive-produced by Lorne Michaels. The show records from Studio 6B in Rockefeller Center, New York City. This was the first version of "The Tonight Show" filmed in New York City since "The Tonight Show Starring Johnny Carson" in 1972.
Document 13: The Late Show with Stephen Colbert: The Late Show with Stephen Colbert is an American late-night talk show hosted by Stephen Colbert, which premiered on September 8, 2015. Produced by Spartina Productions and CBS Television Studios, "The Late Show" "with Stephen Colbert" is the second iteration of CBS's "Late Show" franchise. Stay Human, led by bandleader Jon Batiste, serves as the program's house band, and the announcer is program writer Jen Spyra.
Document 14: Late Show with David Letterman: Late Show with David Letterman is an American late-night talk show hosted by David Letterman on CBS, the first iteration of the "Late Show" franchise. The show debuted on August 30, 1993, and was produced by Letterman's production company, Worldwide Pants Incorporated and CBS Television Studios. The show's music director and leader of the house band, the CBS Orchestra, was Paul Shaffer. The head writer was Matt Roberts and the announcer was Alan Kalter. Of the major U.S. late-night programs, "Late Show" ranked second in cumulative average viewers over time and third in number of episodes over time. In most U.S. markets the show aired from 11:35 p.m. to 12:37 a.m. Eastern and Pacific Time, and recorded Monday through Wednesdays at 4:30 p.m., and Thursdays at 3:30 p.m. and 6:00 p.m. Eastern Time. The second Thursday episode usually aired on Friday of that week.
Document 15: Saturday Night Live: Saturday Night Live (abbreviated as SNL) is an American late-night live television sketch comedy and variety show created by Lorne Michaels and developed by Dick Ebersol. The show premiered on NBC on October 11, 1975, under the original title NBC's Saturday Night. The show's comedy sketches, which parody contemporary culture and politics, are performed by a large and varying cast of repertory and newer cast members. Each episode is hosted by a celebrity guest (who usually delivers an opening monologue and performs in sketches with the cast) and features performances by a musical guest. An episode normally begins with a cold open sketch that ends with someone breaking character and proclaiming, "Live from New York, it's Saturday Night!", properly beginning the show.
ground_truth: Fred Armisen