Celine Dion, Helio Castroneves

Will Ferrell, Tom Dreesen

Bob Newhart, Maxwell

National Hollerin' Champions, Julia Stiles, Habib Koite & Bamada

Brooke Shields, John McEnroe, Joe Henry

Eric Kraff, Goran Ivanisevic

Connie Chung

Jason Biggs, Daniel Tosh, Etta James

Charles Grodin, Michael Franti & Spearhead

Sarah Jessica Parker, John Witherspoon

Helen Fielding, Al Lubel

Tom Arnold, Brandi Chastain, Ralph Stanley & The Whites

David Schwimmer, Bjork

Carson Daly, US Marine Corps

Tim Robbins, Amy Sedaris, Jimmy Eat World

Eugene Levy, Rich Hall

Dan Rather, Regis Philbin

Bryant Gumbel, Denis Leary, Tori Amos

Matthew Broderick, John Miller, Odetta & The Boys Choir of Harlem

Walter Cronkite, Will Ferrell, Jewel

Merideth Viera, Stephen Ambrose, Sheryl Crow, Emmylou Harris, and Gillian Welch

Rudolph Giuliani, Katie Harmon

Marcia Gay Harden, Doris Kearns Goodwin, Pete Yorn

Thomas Von Essen, Ben Stiller, Tenacious D

Hillary Clinton, Cast of '42nd Street'

Jason Alexander, Don Zimmer, Wyclef Jean

Elton John, Steve Zahn

Kate Beckinsale, Chris Kattan, Sarah Harmer

John Cusack, Grant Paulsen, Joe Strummer

Owen Wilson, Lisa Ling, Ryan Adams

Joshua Jackson, Tiki Barber, Emo Phillips

Farrah Fawcett, Tina Fey, Garbage

Tom Cavanagh, Steve Hartman, Leona Naess

Nathan Lane, Cokie Roberts

Bruce Willis, Cody Arens, Alicia Keys

Rose McGowen, Sarah Vowell, Jim Gaffigan

Steve Kroft, Bruce McCall, John Mellencamp

Jack Hannah, Justin Long, Daniel Rodriguez

Ethan Hawke, Judith Miller, Quincy Jones

John McCain, Brittany Murphy, Macy Gray

Kevin Kline, Richard Holbrooke, Caroline Rhea

David Hyde Pierce, U2

David Spade, Marv Albert, Laurie Anderson

Kevin Spacey, Amy Sedaris

Tom Brokaw, Gene Catron

John Travolta, Harland Williams

Jack Black, Tony Bennett

Billy Crystal, Britney Spears

Marge Helgenberger, Gil de Ferran, Lyle Lovett

Stupid Pet Tricks, Vince Vaughn, Faith Evans

Richard Dreyfus, Brett Butler

Martin Lawrence, Natalie Merchant

Barbara Walters, David Radcliffe, Natalie Merchant

Harry Connick Jr., Bernie Mac

Steve Martin, Earl Scruggs

Richard Harris, George Carlin

Kevin James, Deion Sanders

Julia Roberts, Shelby Lynne

Jenna Elfman, Kid Rock

David Sedaris, Five for Fighting

Ray Romano, Mitch Hedberg

Kelly Ripa, Mort Sahl

George Clooney, Martha Stewart

Noah Wyle, George Miller, Carole King

Julia Stiles, Jeff Gordon

Jada Pinkett Smith, Thomas Friedman

Ellen DeGeneres, Dave Gorman, Kelly Goldsmith

Mariah Carey, Elijah Wood, Stereophonics

Andy Garcia, Chris Matthews

Kid Scientists, Liv Tyler, Cake

Michelle Pfeiffer, Dennis Regan

Meg Ryan, Diana Krall

Kevin Spacey, Jerome Bettis, Jane Monheit

Jamie Foxx, Rhys Ifans, Darlene Love

Marisa Tomei, Lenny Kravitz

Peter Jennings, Tom Ryan

Ian McKellan, Phil Simms

Rudolph Giuliani, P.O.D.

Lauren Graham, Eddie Brill

Gwyneth Paltrow, Starsailor

Cate Blanchett, Timothy Treadwell

Jennifer Connelly, Colin Soloway

Jack Black, Foo Fighters

Tom Cruise, Tom Papa

Ethan Zohn, Josh Hartnett, Remy Zero

Cuba Gooding Jr., Jewel

David Brenner, Howie Long, Jewel

Cynthia Nixon, Mario Andretti, Willie Nelson & Rob Thomas

Darrell Hammond, Elayne Boosler, Willie Nelson & Lyle Lovett

Jimmy Kimmell, Julie Bowen, Cracker

Bruce Willis, Ivan Neville

Tim Russert, Jason Schwartzman

Merv Griffin, Phantom Planet

Regis Philbin, Steven Wright

LL Cool J, John McEnroe

Amy Brenneman, Martin Rees, Shakira

Adam Vinatieri, Chris Matthews

Mariska Harkitay, George Divoky, Alan Jackson

Andy Richter, Jake Johannsen

Janet Jackson, Enrique Iglesias

Denis Leary, India.Arie

Kelly Clark, Jeri Ryan

Calista Flockhart, Incubus

Colin Farrell, Colin Quinn

Ross Powers, Mila Kunis

Casey FitzRandolph, Ashleigh Banfield

Simon Ammann, Kevin Bacon

Halle Berry, Jonny Moseley

Richard Dreyfuss, Jeff Foxworthy

Jill Bakken and Vonnetta Flowers, Kelsey Grammer, Alanis Morissette

Martin Short, Jack Hanna

Stupid Human Tricks, Cher

Tom Arnold, Nappy Roots

Cokie Roberts, Al Lubel

Ray Romano, Jason Kidd

Regis Philbin, Andie MacDowell, Evelyn Glennie

Rene Russo, Bob Sarlatte, The Chieftains

John McCain, The White Stripes

Jon Stewart, Kit Armstrong

Bonnie Hunt, N.E.R.D.

Adam Arkin, Amy Sedaris, Midnight Oil

Barbara Walters, Shannon McNally

Peter Krause, Doris Kearns Goodwin

Robin Williams, Sevendust

Andy Dick, Mike Britt

Marv Albert, Charlotte Ross

Tim Robbins, Jimmie Walker, Cast of Oklahoma

Michael J. Fox, Patti Smith

Selma Blair, Dick Enberg

Bob Newhart, Demetri Martin

Rosie Perez, George Miller

John Ashcroft

Sandra Bullock, Billy Norris, Sheryl Crow

Dee Dee Davis, Cameron Diaz, The Strokes

Matthew Conaughey, John Witherspoon

Ashton Kutcher, Oliver Atukudzi

Landon Shuffett, Seth Green, Elvis Costello

Tiffani Thiessen, Bill Walton, Bonnie Raitt

Charlie Sheen, Paul Westerberg

The Rock, Dwayne Kennedy

Charlie Sheen, Paul Westerberg

Incredible Dog Challenge, Debra Messing, Wilco

Kirsten Dunst, Steve Nash, Angie Stone & The O'Jays

Tobey Maquire, Trey Anastasio

Jennifer Garner, Jim Gaffigan

Mary Tyler Moore, Norah Jones

Richard Gere, Reggie Miller

Will Ferrell, Tom Waits

Hugh Grant, Tony Hawk

Gillian Andersen, Jonathan Katz

Liza Minnelli

Kid Scientists, Allison Janney, Al Green

Alec Baldwin, Ted Nugent

Stupid Human Tricks, Natalie Portman, X-ecutioners, Xzhibit, Biohazard

Kathie Lee Gifford, Brian Regan

Vecepia Towerey, Hilary Swank, The Firecrackers

Diane Sawyer, Jesse Martin

Jennifer Lopez, April Kleinschmidt, Patty Loveless

Jon Favreau, David Rakoff, Anton Figg

Charles Grodin, Wendy Liebman

Jimmy Kimmel, Tom Dreesen, Goo Goo Dolls

Chris Rock, Jack Johnson

Nicolas Cage, Abi Thomas, Jimmy Eat World

Zach Braff, Kathleen Madigan

Christian Slater, David Bowie

Sarah Michelle Gellar, John McEnroe

Freddie Prinze, Jr., Alicia Keys

Jodie Foster, Jack Hanna

Matt Damon, Marc Maron

Stupid Human Tricks, Tom Cruise, The Flatlanders

Ellen DeGeneres, Al Franken

Piedmont Birdcallers, Lauren Ambrose, Moby

Harrison Ford, ...And You Will Know Us By The Trail of Dead

Connie Chung, Gary Mule Deer

Will Smith, Landon Donovan, Yo Yo Ma & The Silk Road Project

National Hollering Champions, Adam Sandler, Trik Turner

Tom Brokaw, Bow Wow

Michelle Williams, Barry Sonnenfeld

Christina Ricci, Daniel Tosh, Ben Kweller

Tom Hanks, Dolly Parton

Stupid Pet Tricks, Jude Law, rubyhorse

Robin Williams, Pat Green

Paul Newman, Counting Crows

Nathan Lane, Hugh Fink

Serena Williams, Tom Arnold, Dave Matthews Band

Catherine Keener, Mario Batali, Solomon Burke

Sarah Jessica Parker, Etta James

Geena Davis, Robert Plant

Ted Koppel, Wendy Liebman

Haley Joel Osment, Bill Scheft, Dashboard Confessional

Kristen Johnson, Kinky

Dana Carvey, Ben Kilham

Amy Sedaris, Chazz Palminteri, Weezer

Bill Cosby, Tift Merritt

Julia Stiles, Mike Daisey, Wyclef Jean

Joan Rivers, Zooey Deschanel

Blaine Mayhugh, Joaquin Phoenix, Little Richard

Mike Myers, Bruce Springsteen & The E Street Band

Bruce Springsteen & The E Street Band, Mitch Hedberg

Matthew Perry, The Vines

Robin Williams, James Taylor

Al Pacino, Roger Clemens

Elizabeth Hurley, Tom Ryan

Stupid Human Tricks, Jimmy Fallon, Dirty Vegas

Chris Elliot, Eliza Dushku, Dixie Chicks

John Travolta, Nelly

Caroline Rhea, Jake Gyllenhall

Martin Short, Lewis Black