Soon Per Kragh-Møller was replaced by Bo Thrige Andersen and Steen Lange by Arne Würgler, and the band name was shortened to Burnin Red Ivanhoe.
The record label Sonet became aware of the band and released their debut album M 144 as a double LP in 1969.
In addition to Claësson, Vogel, Würgler and Anderson, Kim Menzer (vocals, trumpet, saxophone and harmonica), Ole Fick (vocals and guitar), Steffen Andersen and Mads Vinding (both bass) were also involved as new band members.
Burnin Red Ivanhoe play proto-progressive rock influenced by blues and jazz with Danish lyrics on M 144.
On Right On (1974), Kenneth Knudsen (keyboard) and Karsten Lyng (vocals), but no longer Kim Menzer, can be heard.