Matthew Kiichi Heafy is a Japanese-American musician, best known as the guitarist and lead vocalist for heavy metal band Trivium. He was also the lead vocalist for the band Capharnaum, along with Trivium's former producer Jason Suecof. In 2017, Heafy was voted sixth on the Ultimate Guitar list "Top 25 Greatest Modern Frontmen".

Ronald Warren Anderson was an American vocal coach and opera singer, best known for teaching vocals to various famous singers, most notably Axl Rose, Chris Cornell, M. Shadows, Myles Kennedy, Ozzy Osbourne, Matt Heafy, Seal, Alicia Keys, Tom Cruise, Mary J. Blige, Lenny Kravitz, Neil Diamond, Adele, The Weeknd, Joss Stone, Red Hot Chili Peppers, Tom Keifer, Hayley Williams, Christina Perri, Lzzy Hale, Janet Jackson, Avril Lavigne, Timothy B. Schmit, Nancy Wilson, Diego Boneta, Five for Fighting, and Björk.