The "Jack Bone Group" was the first band of Marlon Klein and his brother Hans Peter. At that time they had a rehearsal room in Herford next to the better known Missus Beastly. The earliest known recordings are from 1973, in the line-up:
Hans-Peter Klein - vocal & guitar
Wolfgang Nickel - Hammond A100
Manfred Deppe - e-viola & Galanti bass
Marlon Klein - drums