Musicians :
Don Ellis (trumpet, electric trumpet, fluegelhorn, drums), Fred Selden (alto & soprano saxophone, flute, piccolo, alto flute), Vince Denham (alto, tenor & soprano saxophone, flute, piccolo), Sam Falzone (tenor saxophone, clarinet, flute), Gary Herbig (baritone & soprano saxophone, clarinet, flute, oboe), Gil Rathel (trumpet, fluegelhorn), Bruce Mackay, Jack Caudill (trumpet, fluegelhorn), Sidney Muldrow (french horn), Mike Jamieson (trombone), Ken Sawhill (bass trombone), Doug Bixby (tuba), Jay Graydon (guitar, bag), Milcho Leviev (piano, piano Fender Rhodes, organ, clavinet), Dave McDaniel (bass), Lee Pastora (conga), Joel Quivey, Earle Corry (electric violin), Renita Koven (electric viola), Pat Kudzia (electric cello), Ron Dunn, Ralph Humprey (drums, percussion).

The last album by Don Ellis' big band before the trumpeter suffered a heart attack that would ultimately cut short both his career and his life, this underrated set finds Ellis' orchestra consisting of seven brass (including tuba), four strong woodwind players, a string quartet, and an enlarged six-piece rhythm section that includes guitarist Jay Graydon and keyboardist Milcho Leviev.

A special highlight is "Invincible" which is an outstanding feature for altoist Vince Denham. Ellis composed four of the eight originals including one titled "The Devil Made Me Write This Piece".