- Tom Bachik
- Gucci Westman
- Dick Page
- Mally Roncal
- Poppy King
- Marcia Kilgore
- Tia Dantzler
- Jenn Karsten
- Josie Maran (one and two)
- Wende Zomnir
- Sara Happ
- Jake Bailey
- Mai Quynh
- Sonia Kashuk
- Sinead Norenius
- Stacey Schieffelin
- Jemma Kidd
- Piret Aava and Tamara Palumbo
- Maureen Kelly
- Kimara Ahnert
- Minna Ha
- Mario Dedivanovic
- Agostina
- Darac
- Kerry Malouf
- Laura Mercier
- Jerrod Blandino
- Felicia Roman and Jennifer Sullivan
- Jennifer Maloy
- Shana King
- Dianne Brill
- Samantha Lennon
- Danna Homburger
- Paula Dorf
- Passion Pit
- The Wanted
- Steven Tyler and Joe Perry of Aerosmith
- Jay McGuiness of The Wanted
- Carly Rae Jepsen
- Matthew Morrison
- Avril Lavigne
- Adam Levine
- J Cole
- Tiësto
- Martin Solveig
- Matt Pinfield
- Game
- Jordin Sparks
- Simon Cowell
- Nick Rhodes of Duran Duran
- Jesse McCartney
- Ne-Yo
- Josh Groban
- Far East Movement
- Nicolas Cage
- Katy Perry
- Kate Winslet and Leonardo DiCaprio
- Robin Thicke
- Toby Keith
- T.I.
- ‘Remember the Daze’ cast
- Ian Bates of Manners
- Seth Aaron of Children 18:3
- Josh Scogin of The Chariot
- Kimberly Goss
- Hank3
- Fear Factory bassist Matt DeVries
- Dilana Robichaux
- Jesse Ketive of Emmure
- Stephen Carpenter of Sol-Invicto
- Dan Donegan of disturbed
- Matt Drake of Evile
- Andy Atkins of A Plea for Purging
- Brent Hinds of Mastodon
- Bill Gaal
- Toby Morse of H20
- Vivian Campbell
- David Vincent of Morbid Angel
- Don Jamieson
- Scott ‘Wino’ Weinrich
- Mike Portnoy
- Sugar Ray’s Mark McGrath
- Anthony Raneri of Bayside
- Ryan Clark of Demon Hunter
- Maria Brink of In This Moment
- Devin Townsend
- Lemmy Kilmister
- Spencer Chamberlain of Underoath
- Bobby “Blitz” Ellsworth
- Sean Yseult of White Zombie
- Kirk Windstein
- Dani Filth Cradle of Filth
- Josh Todd of Buckcherry
- Kerry King of Slayer
- Zakk Wylde
- Mike Valley
- Phil Anselmo
- Ozzy Osbourne
- Glenn Danzig
- Richie Birkenhead (one and two)
- Mike Patton
- Biohazard’s Evan Seinfeld
- Serj Tankian
- Phil Anselmo
- Marc Colombo of Free Reign
- Sean Kinney of Alice In Chains
- Morgan Lander of Kittie (one, two)
- Chris Adler of Lamb of God
- Ville Valo of HIM
- Aaron Lewis of Staind
- King Diamond
- Maynard James Keenan (one, two)
- Rob Dukes of Exodus
- Paul Landers of Rammstein
- Brann Dailor of Mastodon
- Tom Morello
- Marilyn Manson
- Kerry King of Slayer
- Al Jourgensen
- Scott Stapp of Creed
- Brian “Head” Welch
- Jamey Jasta of Hatebreed
- Rob Halford of Judas Priest
- Brian Fair of Shadows Fall
- Mark Morton of Lamb of God
- Karl Buechner of Earth Crisis
- Maurizio Iacono of Ex Deo
- Scott Ian of Anthrax
- Phil Anselmo (Part one, two, three)
- Vinnie Paul