?

? (or sometimes Question or Question Mark) is a Christian progressive rock concept album by multi-instrumentalist Neal Morse, his fifth studio album. Released in 2005, this single-CD album is about the tabernacle in the wilderness. Morse has stated that this album should be considered one long epic track rather than twelve separate tracks.
The main band is Neal, Mike Portnoy (ex-Dream Theater), and Randy George (Ajalon) with guests Mark Leniger, Alan Morse (Spock's Beard), Roine Stolt (The Flower Kings), Steve Hackett (Genesis), and Jordan Rudess (Dream Theater)

Lineup

Neal Morse (Spock's Beard, Morse/Portnoy/George, The Neal Morse Band) - Lead Vocals/Keyboards/Guitars
Randy George (Ajalon, Morse/Portnoy/George, The Neal Morse Band) - Bass
Mike Portnoy (Dream Theater, Morse/Portnoy/George, The Neal Morse Band) - Drums/Vocals

Guest Artists

Revonna Cooper - Vocals
Amy Pippin - Vocals
Debbie Bresee - Vocals/Background Vocals
Wade Brown - Vocals
Joey Pippin - Vocals
Roine Stolt (Kaipa, The Flower Kings, Transatlantic) - Guitars
Alan Morse (Spock's Beard) - Guitars
Steve Hackett (Genesis) - Guitars
Mark Leniger - Guitars
Jordan Rudess (Dixie Dregs, Vinnie Moore, Dream Theater) - Keyboards
Chris Carmichael (Fifteen Strings) - Violin/Cello
Michael Thurman - French Horn
Rachel Rigdon - Violin
Jim Hoke - Saxophone
Jay Dawson - Bagpipes