Lena Dunham; Max Greenfield; Brandy Clark

From "Girls", creator and actress Lena Dunham; from "New Girl", actor Max Greenfield; musical guest Brandy Clark.

Joel McHale; Marv Albert; Washed Out

From "Community", actor Joel McHale; sportscaster Marv Albert; musical guests Washed Out.

Scarlett Johansson; John Grant

From "Captain America: The Winter Solider", actress Scarlett Johansson; musical guest John Grant.

Anderson Cooper; Bobby Moynihan; Will Hoge

TV host Anderson Cooper; from "Saturday Night Live", comedian Bobby Moynihan; musical guest Will Hoge.

Mindy Kaling; Jeff Altman; Red Fang

From "The Mindy Project", creator and actress Mindy Kaling; stand-up comedy by Jeff Altman; musical guests Red Fang.

Bill Cosby; Sleigh Bells

Comedy legend Bill Cosby; musical guests Sleigh Bells.

Michael Strahan; Jennifer Nettles

From "LIVE with Kelly and Michael", co-host Michael Strahan; musical guest Jennifer Nettles.

Kevin Hart; Mo Rocca; The Orwells

Actor and comedian Kevin Hart; from "My Grandmother’s Ravioli" and "CBS Sunday Morning", journalist Mo Rocca; musical guests The Orwells.

Brian Williams; Rosanne Cash

New anchor Brian Williams; musical guest Rosanne Cash.

Don Cheadle; Myq Kaplan; Roadkill Ghost Choir

From "House of Lies", actor/producer Don Cheadle; stand-up comedy by Myq Kaplan; musical guests Roadkill Ghost Choir.

Andy Samberg; Michael B. Jordan; Ellie Goulding

From "Brooklyn Nine-Nine", actor and comedian Andy Samberg; from "That Awkward Moment", actor Michael B. Jordan; musical guest Ellie Goulding.

Martin Scorsese; Allison Williams; Cults

From "The Wolf of Wall Street", director Martin Scorsese; from "Girls", actress Allison Williams; musical guests Cults.

Rachel Maddow; Spike Jonze; No Age

TV host and journalist Rachel Maddow; from "Her", director and writer Spike Jonze; musical guests No Age.

Kevin Bacon; Pat McGann; Devon Avenue

From "The Following", actor Kevin Bacon; stand-up comedy by Pat McGann; musical guests Devon Avenue.

Louis C.K.; B.J. Ganem; Artic Monkeys

From "Louie", creator and comic Louis C.K.; Marine veteran B.J. Ganem; musical guests Artic Monkeys.

Eric Stonestreet; Nick Goepper; Bastille

From "Modern Family", actor Eric Stonestreet; freeskier Nick Goepper; musical guests Bastille.

Drew Brees; B.J. Novak; Against Me!

New Orleans Saints quarterback, Drew Brees; actor/author/comedian B.J. Novak; a Top Ten List presented by David Stern; musical guests Against Me!.

Dr. Phil McGraw; Danny Koker; Dum Dum Girls

TV host Dr. Phil McGraw; from "Counting Cars", TV personality Danny Koker; musical guests Dum Dum Girls.

Bill Murray; Eagulls

From "The Monuments Men", actor/comic Bill Murray; musical guests Eagulls.

Will Arnett; Broken Bells

George Clooney; Sting

Matt Damon; Lenny Kravitz

Patrick Stewart; The Flaming Lips

Regis Philbin; Ms. Lauryn Hill

Kevin Spacey, Amber Heard, a Top Ten List presented by the cast of

Sage Kotsenburg, Kate Mara

Cole Swindell?

Kaitlyn Farrington, Lupita Nyong'o, Little Dragon

Keri Russell, Terry Fator

Pauley Perrette, Jeff Caldwell, Lake Street Dive

Kaley Cuoco-Sweeting, Dale Earnhardt, Jr., The Fray

Olympic Gold Medalist Ted Ligety, Kat Dennings, Lo-Fang

Meredith Vieira, Band of Horses

Stupid Human Tricks, Simon Helberg, Young the Giant

Jack (Jungle) Hanna, Jake Johannsen

Zach Braff, Sgt. Brendan Marrocco & Dr. Andrew Lee, Future Islands

Michael Keaton, Phantogram

Tom Selleck, Carrie Brownstein, David Nail

Tom Brokaw, Andrew Hadlock, Bob Mould

Mary-Louise Parker, Lenny Marcus, Joan Jett & the Blackhearts

Sen. John McCain, Little Mix

Jason Bateman, Miles Teller, Gary Allan

Sylvester Stallone, Theo James, Ledisi

Bryan Cranston, Melissa Rauch, Le1f

Bill O'Reilly, Nick Griffin, the Dough Rollers

Jimmy Carter

Emma Watson, Nick Offerman, a musical tribute to Johnny Cash

Peter Dinklage, Hari Kondabolu, Sage the Gemini

Cobie Smulders, Nick Cannon, Manchester Orchestra

Kristin Chenoweth, Amy Schumer, Johnnyswim

Bill Murray, Martha Stewart, Lady Gaga

Johnny Depp, Kevin Drew

Billy Crystal, Tony Hale, Liv Warfield

Rob Lowe, Brooklyn Decker, London Grammar

Lindsay Lohan, Jamie Edwards, Real Estate

Courteney Cox, Jimmie 'J.J.' Walker, Christina Perri

Stephen Colbert, Robin Roberts, Kelis

Sally Field, Timothy Simons, Needtobreathe

Neil Patrick Harris, Sarah Hyland, Ray LaMontagne

Piedmont Bird Callers, Michael J. Fox, Naughty Boy

Joel McHale, Vera Farmiga, Aloe Blacc

Lucy Liu, Ziggy Marley

Kiefer Sutherland, Adam Resnick, Benjamin Booker

Louis C.K., a performance from the Broadway cast of Rocky

Don Rickles, Carmen Lynch, the Ghost of a Saber Tooth Tiger

Shailene Woodley, Peyton Manning

Jon Cryer, Elizabeth Olsen, Foster the People

Mariah Carey, Rick Harrison

James Franco, Idina Menzel, a performance by the Broadway cast of 'If/Then'

Nathan Fillion, Tom Dreesen, Hunter Hayes

Harry Connick Jr., Jesse Eisenberg, the Black Keys

Jim Parsons, Julie Chen, Hozier

Barbara Walters, Elle Fanning, Randy Houser

Adam Sandler, Thomas Haden Church

Lea Michele, Andy Kindler, Chromeo

Jack Hanna, Stephen Malkmus & the Jicks

Kid scientists, Sarah Silverman, We Are Scientists

Sgt. Kyle J. White, Judy Greer, Dierks Bentley

Donald Trump, Indianapolis 500 winner Ryan Hunter-Reay, Elizabeth Cook

Martin Short, John Oliver, Spanish Gold

Anderson Cooper, Victor Espinoza, the Afghan Whigs

Hugh Jackman, Joe List, Elvis Costello

Kelsey Grammer, Willie Nelson

Dave Chappelle, Laura Prepon, a Top Ten List presented by Miss USA, the Orwells

Christopher Walken, Janelle Monae, Tatiana Maslany, Miss USA 2014

Regis Philbin, Paul Morrissey, First Aid Kit

Susan Sarandon, Whitney Cummings, Angel Olsen, David Sanborn

Olivia Wilde, Shep Gordon, Empires

Dana Carvey, Ellie Kemper, Sam Smith

Paul Rudd, Jeff Altman, John Doe

Adam Levine, Gen. Frank J. Grass, Broken Bells

Melissa McCarthy, Rachelle Lefevre, Phish

Mark Wahlberg, Ben Falcone, Hurray for the Riff Raff

Mark Ruffalo, Former Marine Lance Cpl. William 'Kyle' Carpenter

Halle Berry, Steve Young, War on Drugs

Joan Rivers, Capital Cities

Lizzy Caplan, Sleeper Agent

Michael Douglas, Paul Morrissey, Kiesza

Kurt Russell, Hannibal Buress, Sturgill Simpson

Jason Segel, Liv Tyler, Trampled By Turtles

Emma Stone, Nathan Fielder, American Authors

Colin Firth, Tommy Johnagin, EMA

Jeff Daniels, Norah O'Donnell, A Special Performance of 'MacArthur Park'

Dave welcomes actor Jeff Daniels, "CBS This Morning" co-anchor Norah O'Donnell, and a performance of the song "MacArthur Park" by an all-star ensemble.

Ricky Gervais, Taylor Schilling, Eli Young Band

Eric Stonestreet, Brody Dalle

Staff Sgt. Ryan Pitts, Sharon Van Etten

John C. Reilly, Rachelle Lefevre, Conor Oberst

Chris Pratt, Rodrigo y Gabriela

Zoe Saldana, Crash

Julia Louis-Dreyfus, Simon Amstell, David Gray

Bruce Willis, the Gaslight Anthem

Joseph Gordon-Levitt, Novak Djokovic, Robby Johnson

Kathy Griffin, Ken Burns, Jeremy Messersmith

Serena Williams, Chadwick Boseman, Echo & the Bunnymen

Michael Cera, dock diving dogs, Lyle Lovett

Howie Mandel, EMA

James McAvoy, Chris Russo, The Last Internationale

Mike Myers, Bonnie McFarlane, John Fullbright

Luke Wilson, Julie Chen, Lee Brice