Have you a heard a song that featured both vocalists of Savatage on one song? Yes, Jon Oliva and Zak Stevens sing together along on one track?
"Into the Arc Time" is a song by Soulspell that featured both Jon Oliva and Zak Stevens from Savatage on vocals. The song "Into the arc of time" was featured on Soulspell's 2010 album "The Labyrinth of Truths".
SoulSpell is a symphonic metal project that was created by Heleno Vale and their 2010 album "The Labyrinth of Truths" featured a large number of metal icons including Jon Oliva and Zak Stevens from Savatage, Roland Grapow from Helloween, Nando Fernandes from Hangar, Blaze Bayley from Iron Maiden and Tim Ripper from Judas Priest and Iced Earth
Enjoy